Revision of the Neotropical genus Marbenia Malloch ...

Zootaxa 3872 (4): 365–375 www.mapress.com /zootaxa / Copyright © 2014 Magnolia Press

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http://dx.doi.org/10.11646/zootaxa.3872.4.3 http://zoobank.org/urn:lsid:zoobank.org:pub:BBE196C1-10A1-40B6-84B3-6462134B558C

Revision of the Neotropical genus Marbenia Malloch (Diptera: Periscelididae) ROSALY ALE-ROCHA1,2, GEOVÂNIA FREITAS1,3 & WAYNE N. MATHIS4 1

Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av.Andr Araújo, 2936, Petrópolis, CEP 69067-375, Manaus, Amazonas, Brazil 2 Fellowship PQ/CNPq. E-mail: [email protected] 3 Fellowship CNPq; Graduate Program in Entomology. E-mail: [email protected] 4 Department of Entomology, NHB 169, PO Box 37012; Smithsonian Institution, Washington, D.C. 20013-7012, USA. E-mail: [email protected]

Abstract The Neotropical genus Marbenia Malloch is revised and now includes 3 species: Marbenia cinerea, sp. nov., Marbenia pallida, sp. nov. and Marbenia peculiaris Malloch, 1931. The genus is herein recorded from the amazonian region of South America (Bolivia, Brazil and Ecuador), and characters of male and female terminalia are illustrated for the first time. Key words: Periscelidinae, systematics; Neotropical Region, Amazonian Region

Introduction Periscelididae is a small family of Diptera characterized by the convex and setose face, frons with 1–2 frontoorbital setae, pedicel cap-like with a dorsal cleft, arista bipectinate, and postocellar setae divergent or absent. Mathis & Rung (2011) provided a global catalog for the family, where a complete diagnosis is found. The concept of Periscelididae, as adopted here, follows McAlpine (1978, 1983) and comprises ten extant genera and one extinct genus (Procyamops, known from Baltic amber). Three of the extant genera are cosmopolitan (Cyamops Melander, Periscelis Loew, and Stenomicra Coquillett). Stenocyamops Papp is known from a species from Thailand and a few species from Fiji, and the remaining genera are mostly restricted to the Neotropics (Diopsosoma Malloch, Marbenia Malloch, Neoscutops Malloch, Parascutops Mathis & Papp, Planinasus Cresson, and Scutops Coquillett) (Mathis & Rung 2011). Two subfamilies (Periscelidinae and Stenomicrinae) have been recognized for the Periscelididae (Grimaldi & Mathis 1993; Baptista & Mathis 1994; Mathis & Papp 1998), although the monophyly of only Periscelidinae is well corroborated (Mathis & Rung, 2011). Marbenia Malloch, 1931 is a rare Neotropical genus that was only known previously by its type species, M. peculiaris Malloch, 1931, which was collected in Panama. Malloch (1931) based his description of Marbenia on wing venation and shape of face: Costal vein extended only to the apex of vein R4+5, vein A1+CuA2 faint, and face with transversal depressions. The genus is placed in the subfamily Periscelidinae together with Periscelis Loew, Neoscutops Malloch, Parascutops Mathis & Papp, Scutops Coquillett and Diopsosoma Malloch (Mathis & Rung 2011). These genera form a monophyletic group that shares the following putative synapomorphies: mouth opening large; costal vein short, extended only to vein R4+5; only one fronto-orbital seta, reclinate; a silvery white stripe on the occiput, adjacent to the posterior margin of the compound eye (absent in some species); vein CuA2 reduced or absent; cell dm with a fold throughout its length; spiracle 7 within tergite 7 in female postabdomen; postpronotal seta well developed (Grimaldi & Mathis 1993, Baptista & Mathis 1994, Mathis & Papp 1998). In this paper, we redescribe M. peculiaris, including characters of the male, and provide additional distributional data for the species. We also describe two new species, Marbenia cinerea sp. nov. and Marbenia pallida sp. nov., based on specimens collected in South America. Accepted by S. Gaimari: 25 Sept. 2014; published: 10 Oct. 2014

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Material and methods The terminology adopted in the descriptions follows Cumming & Wood (2009). The terminalia were removed from the abdomen, treated with hot 85% lactic acid, and placed in a genitalia microvial containing glycerin. Wings were photographed after being removed from the specimen and slide mounted. The length of the wing was measured from the base of the alula to the apex of the wing. The microvial and cover slides were pinned together with their associated specimens. The material is deposited in the Collection of Invertebrates of Instituto Nacional de Pesquisas da Amazônia—INPA (Manaus, Brazil); Museu Paraense Emílio Goeldi—MPEG (Belém, Brazil); and the National Museum of Natural History, Smithsonian Institution—USNM (Washington DC, USA). Label data of holotypes are cited verbatim; lines are delimited by a slash ( / ) and a semicolon separates data quoted from different labels.

Taxonomy Marbenia Malloch Marbenia Malloch, 1931: 31. Type species: M. peculiaris Malloch, 1931 by original designation. Prado, 1975: 1–3 (Neotropical catalog); Mathis & Rung, 2011: 350, 352 (world catalog).

Diagnosis. Small flies, body length 2.6–3.5 mm; maxillary palpus short and spatulate; setae of head elongate, postocellar pair well developed; face lacking setae, only a pair of setae on the facial plate, with transverse furrows giving face a wavy appearance; parafacial, gena and occiput with many strong setae; arista bipectinate; two pairs of dorsocentral setae; wing banded; R1 with dorsal setae; R2+3 long and arcuate; M1 almost straight; bm-cu complete; CuA2 lacking; A1+CuA2 extended nearly to wing margin; abdominal tergites 1+2 fused laterally. Redescription. Body length: 2.6–3.5 mm. Head. Frons with parallel or slightly divergent margins anteriorly and slightly divergent on vertex; face lacking setae, only a pair of setae on the facial plate, internal to the genal row of setae, with transversal furrows giving face a wavy appearance; fronto-orbital plate with series of short setae below fronto-orbital seta; parafacial with well-developed setae, becoming longer and more robust toward ventral region. Buccal structures: palpus flat, short and spatulate, setose on distal half; clypeus U-shaped, microtomentose. Antenna: scape short; pedicel cap-like with dorsal cleft; first flagellomere elongate oval; arista bipectinate with dorsal and ventral rays decreasing progressively in length toward apex intercalated by some shorter rays. All setae conspicuous; ocellar triangle not setulose, ocellar pair well developed; postocellar setae developed and divergent; medial and lateral vertical setae well developed; 1 fronto-orbital long and reclinate. Gena and occiput with many strong setae. Thorax robust, approximately as wide as long (scutellum excluded); subscutellum protuberant; scutum covered with short setae, scutum and scutellum covered with dense pruinescence; 1 postpronotal, 2 notopleural, 1 postsutural supra-alar, 1 postalar, 2 postsutural dorsocentral, 1–3 katepisternal and 2 pairs of scutellar setae. Wing banded; subcosta incomplete; R1 with setulae on dorsal surface; R2+3 long and arcuate; M1 almost straight; M1 and CuA1 extended to wing margin; CuA2 lacking; A1+CuA2 extended nearly to wing margin; cell dm with longitudinal fold. Legs robust; mid tibia with 1 black apicoventral spine; mid tarsus with small black apical spines on ventral surface. Abdomen rather broad, covered by short setae and sparse pruinescence. Tergite 1+2 fused, with transverse unsclerotized region in the middle and longitudinal weak line dividing tergite medially up to membranous area. Male terminalia: symmetrical; sternite 6 well developed, tergite 6 slender; pregenital sclerite (syntergosternite 7+8) reduced to dorsolateral narrow stripe, free from tergite 6 or partially fused with tergite 6, and including spiracle 7; epandrium convex; surstylus undifferentiated; postgonites articulated at anterior margin of hypandrium, partly encircling base of phallus; cercus developed and setose; phallus long, ribbon-like; genital pouch (hypandrium + phallapodeme) large, inflated, slightly sclerotized, forming a bursa-like chamber containing the phallus; hypandrial arms long and fused anteriorly around base of phallus. Female terminalia: tergite 7 and sternite 7 fused, forming a complete ring; tergite 8 and sternite 8 free; sternite 8 broad, slightly concave on anterior margin; tergite 8 convex; cercus small, rounded. Remarks. The relationships among Periscelidinae genera remain largely unsubstantiated. Ale-Rocha & Freitas (2011) suggested that Marbenia and Neoscutops are closely related based on one putative synapomorphy, vein R1

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setulose dorsally. This character state is unique to Marbenia and Neoscutops, and conveniently distinguishes them from other genera in the subfamily Periscelidinae. Marbenia can be distinguished from Neoscutops by two characters: 2 postsutural dorsocentral setae (absent in Neoscutops); veins R2+3 and M1 almost straight (R2+3 and M1 distinctly curved in Neoscutops). Geographical distribution. Neotropical (Bolivia, Brazil, Ecuador, Panama).

Key to the species of Marbenia Malloch 1. 2. -

Frons brown or pale brown with lateral margins yellow; face brown with small yellow spots (Fig. 17); wing predominantly brown, with basal 1/3 yellowish and 2 hyaline spots in the brownish portion (Fig. 19) . . . . . . . . .Marbenia peculiaris Malloch Frons entirely yellow; face pale brown or yellow (Figs 2, 9); wing yellowish tinged with apical , posterior margin and a transverse band gray (Figs 4, 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Scutum covered with sparse pale gray pruinescence (Fig. 3); face pale brown, lacking spots, with 1 transversal furrow (Fig. 2); gena and postgena brown; abdomen brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Marbenia cinerea, sp. nov. Scutum covered by dense golden pruinescence (Fig. 10); face yellow with lateral margins darkened on upper half, with 2 deep transversal furrows (Fig. 9); gena and postgena yellow; abdomen pale brown . . . . . . . . . . . . . . . . . Marbenia pallida, sp. nov.

Marbenia cinerea, sp. nov. (Figs 1–7) Diagnosis. Frons entirely yellow with sparse whitish pruinescence; first flagellomere dark yellow; ocellar tubercle the same color of frons; face pale brown with transverse furrow above middle and slightly protruded below furrow; wing slightly gray tinged with 1 transverse wide hyaline band at base of distal third and hyaline at base, veins yellow on basal half and brown apically; scutum dark brown with postpronotal lobe and postalar callus yellow, covered by silvery gray pruinescence; scutellum yellow. Redescription. Holotype male. Body: 2.6 mm. Wing: 2.1 mm. Head (Figs 2, 3). Frons entirely yellow, including ocellar triangle, mat, with sparse pale yellow pruinescence. Ocellar triangle not protuberant, ocellus yellow forming an equilateral triangle. Medial vertical setae almost twice length of lateral vertical and postocellar setae; postocellar setae slender, divergent; ocellar pair stronger than post-ocular seta, ocellar and fronto-orbital the same length. Face dark yellow to pale brown without spots, subshiny with very sparse whitish pruinescence, more slender than frons. Setae: lower fronto-orbital plate with short brown setulae extended from fronto-orbital seta to insertion of antenna; a pair of convergent pseudo-vibrissae weakly developed, inserted slightly toward medial portion of face at mid height of face; parafacial setae reasonably developed, extended from mid height of face, shorter on dorsal portion and distinctly elongate and strong toward buccal opening; face with 1 deep transverse furrow above middle and slightly protruded below furrow. Parafacial and gena with the same color of face; gena short and wholly setulose. Antenna: scape very short, brown; pedicel velvet black with some short dorsal and marginal setae; first flagellomere dark yellow, with parallel sides, about 2 times longer than wide, inflate; arista bipectinate, with 9 dorsal and 4 ventral branches with some interspersed very short branches. Buccal structures pale brown; labrum small with yellowish pruinescence; palpus short, ovate, setulose. Occiput brown with dorsal margin yellow, postgena pale brown. Compound eye with sparse short setulae between facets. Thorax (Figs 1, 3). Scutum dark brown, paler on lateral margins, with postpronotal lobe and postalar callus yellow; silvery gray pruinescence; scutellum yellow. Setae: 2 postsutural dorsocentral; 2 notopleural; 1 postpronotal; 1 postsutural intra-alar; 1 postalar; all setae well developed; scutellum with one preapical and one sub-basal pairs long and strong. Pleura yellowish brown, with sparse yellowish pruinescence on some regions, clearer on posterior half (anepimeron, katepimeron, meron and laterotergite); 1 long katepisternal seta and some small setae on lower half of katepisternum; 1 slender propleural. Wing (Fig. 4) yellowish tinged with apical , posterior margin and a transverse band gray. Legs short and robust; coxae and femora brown, fore and mid tibiae brown, hind tibia dark brown, all tibiae with a median ring and apices yellow, tarsomeres 1–3 whitish and 2–5 yellow. Fore femur with long robust setae on posteroventral margin; mid coxa with a comb of black strong setae on anterodistal margin; apicoventral spine of the mid tibia developed; mid tarsus with ventral yellow spines on tarsomeres 1–4. Abdomen pale brown; short, ovate, wider on segments 2–3; setae short; tergite 6 slightly longer than the remaining tergites. Terminalia (Figs 5–7): epandrium low, shallowly concave; postgonites rather short, pointed apically, anvil-like in lateral view REVISION OF MARBENIA

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with base projected anteriorly; ejaculatory apodeme short and wide, basal process about half the length of ejaculatory apodeme; phallus wide and long, truncate apically; cerci small, rounded and widely fused medially. Female: unknown. Type material. Holotype ♂ (USNM) labeled: “ECUADOR. Prt. Orellana / Rio Tiputini (038.2' /S, 768.9 W), 12–20 Aug / 1999, W. N. Mathis, A / Baptista, M. Kotrba. Distribution. Ecuador. Etymology. From Latin cinis = ashes, referring to the gray pruinescence that covers the scutum of this species. Remarks. Marbenia cinerea, sp. nov. is similar to M. pallida, sp. nov. in the coloration of the frons, which is entirely yellow, and the mostly yellow wing. Besides the characters given in the key and diagnosis, this species can be distinguished from M. pallida, sp. nov. by the following characters of the male genitalia: postgonites smaller, medial digitiform process absent, cerci medially fused and protuberant in lateral view and ejaculatory apodeme wide with elongated basal process.

FIGURES 1–4. Marbenia cinerea, sp. nov. (holotype): 1, habitus, lateral view; 2, head, frontal view; 3, dorsum of thorax; 4, left wing, dorsal view.


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FIGURES 5–7. Marbenia cinerea, sp. nov., male terminalia (paratype): 5, posterodorsal view of epandrium and internal terminalia; 6, same, lateral view; 7, ejaculatory apodeme, lateral view. All figures in the same scale. Scale = 0.2 mm. Abbreviations: cerc, cercus; ep, epandrium; hypd+phall, hypandrium+phallapodeme; ph, phallus; pg, postgonite. .

Marbenia pallida, sp. nov. (Figs 8–15) Diagnosis. Frons pale yellow with whitish pruinescence; first flagellomere yellow; ocellar tubercle brownish; face, parafacial and gena yellow, face with two transversal grooves in the middle, with a transverse protuberance between them and a shallow rounded protuberance below antennae; wing yellowish tinged with apical , posterior margin and a transverse medial band gray; scutum covered with dense pale gold pruinescence; scutellum yellow.

REVISION OF MARBENIA


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FIGURES 8–11. Marbenia pallida, sp. nov.: 8, habitus, lateral view; 9, head, frontal view; 10, dorsum of thorax; 11, left wing, dorsal view.

Description. Holotype male. Body: 2.9 mm. Wing: 2.5 mm. Head (Figs 9, 10). Frons pale yellow with whitish pruinescence. Ocellar triangle brownish, not protuberant; ocelli yellow forming an equilateral triangle. Medial vertical setae longer than lateral vertical setae, and fronto-orbital seta with intermediary length; post-ocellar setae developed and divergent; ocellar pair the same length of fronto-orbital setae. Face pale yellow with whitish yellow pruinescence above rounded protuberance and on lower lateral margins, slender than the frons, medial portion shiny; parafacial and gena yellow with whitish yellow pruinescence. Setae: lower fronto-orbit with short pale brown setae extended from fronto-orbital setae to insertion of antennae; a pair of developed convergent pseudovibrissae inserted on medial portion of face, below the transverse protrusion; parafacial setae well developed, extended from mid length of face, shorter on upper portion and increasing in length toward buccal opening; face with two transverse grooves in the middle and one transverse protuberance between them and a shallow rounded protuberance below antennae. Parafacial and gena yellow covered by dense whitish pruinescence; gena short and wholly setulose. Antenna: scape very short, black; pedicel black with some short dorsal and marginal setae; first flagellomere yellow, ovate, about 2 times longer than wide; arista bipectinate, with 11 dorsal and 4 ventral branches, and some interspersed very short branches. Buccal structures pale brown to yellow; labrum small with whitish pruinescence; palpus short, ovate, setulose. Occiput yellow; postgena yellow. Compound eye with sparse short setulae between facets. Thorax (Figs 8, 10). Scutum pale brown with postpronotal lobe and postalar callus yellow, covered by dense pale gold pruinescence; scutellum yellow. Setae: 2 postsutural dorsocentral; 2 notopleural; 1 postpronotal; 1 postsutural intra-alar; 1 post-alar; all setae well developed; scutellum with one preapical and one sub-basal pairs long. Pleura pale brown with clearer margins, sparse silvery gray pruinescence on some regions; 2 long katepisternal setae and some small setae between them and on lower half of katepisternum; 1 slender propleural. Wing (Fig. 11) yellowish tinged with apical , posterior margin and a transverse band gray. Legs


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short, robust, brown with all tarsomeres whitish yellow and tibiae with a median ring and apices yellow; fore femur with long robust setae on posteroventral margin; mid coxa with distal pale brown slender setae; apicoventral spine of mid tibia developed; mid tarsus with ventral black spines on tarsomeres 2–4. Abdomen pale brown, short, ovate, wider on segments 2–3; setae short; tergite 6 slightly longer than the remaining tergites. Terminalia (Figs. 12–14): epandrium high, deeply concave; postgonites elongate with medial and lateral lobes, lateral lobe bearing a digitiform process; ejaculatory apodeme elongate and narrow, basal process of length of ejaculatory apodeme; phallus wide and pointed apically; cercus quadrangular in posterior view. Female. As in male except transverse gray band in the middle of wing complete. Terminalia (Fig. 15): syntergosternite 7 narrow, slightly sclerotized; sternite 8 narrow and shallowly concave on posterior margin; tergite 8 as a slender semi-arc; cercus small. Type material. Holotype ♂ (USNM) labeled: “ECUADOR. Orellana / Res. Etnica Waorani / (039.4'S, 7627.2' / W; 216m, lot# 1420) / 1 Oct 1996, T. L. Erwin. Condition of type: good, not dissected. Paratypes. ECUADOR, Orellana: Res. Etnica Waorani (039.4'S, 7627.2'W; 216m, lot# 712), 21 Jun 1994, T. L. Erwin (1♂; INPA); (039.4'S, 7627.2'W; 216m, lot# 1459), 7 Feb 1996, T. L. Erwin (1♀; INPA); (039.4'S, 7627.2'W; 216m, lot# 1420), 1 Oct 1996, T. L. Erwin (2♀; USNM).

FIGURES 12–15. Marbenia pallida, sp. nov.: 4–6, male terminalia (paratype): 12, posterodorsal view of epandrium and internal terminalia; 13, same, lateral view; 14, ejaculatory apodeme, lateral view. 15, Female terminalia: posteroventral view. All figures in the same scale. Scale = 0.3mm. Abbreviations: cerc, cercus; ST, sternite; TG, tergite. REVISION OF MARBENIA


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Distribution. Ecuador (Orellana). Etymology. From Latin pallidus = ashen, referring to the generally pale coloration of this species. Remarks. This species is similar to M. cinerea, sp. nov. It can be easily distinguished from that species by the characters given in the key and diagnosis and characters of the male genitalia (see discussion under Remarks for M. cinerea).

Marbenia peculiaris Malloch (Figs 16–23) Marbenia peculiaris Malloch, 1931: 32, Figs. 9, 10; Prado, 1975: 1–3 (Neotropical catalog); Mathis & Rung, 2011: 352 (world catalog).

Diagnosis. Frons with central portion shiny dark yellow to brown and lateral margins pale yellow to yellow with whitish pruinescence; first flagellomere orange; ocellar tubercle the same color of frons; face brown to pale brown with yellow spots and transverse furrows on medial portion, not protruded; wing gray to brown tinged with 1 transverse narrow hyaline band on middle of distal third, 1 small hyaline spot on crossvein r-m and cell R2+3, and hyaline on basal third; scutum dark brown with postpronotal lobe and postalar callus yellow, covered by silvery gray pruinescence; scutellum yellow. Redescription. Holotype female. Body: 3.5 mm. Wing: 2.75 mm. Head (Figs 17, 18). Frons dark yellow, including ocellar triangle, shiny, with lateral margin pale yellow with whitish pruinescence. Ocellar triangle not protuberant, ocelli yellow forming an equilateral triangle. Medial and lateral vertical setae and fronto-orbital seta the same length; post-ocellar setae developed and divergent (ocellar pair lost in the specimen). Face with sparse whitish pruinescence according to incidence of light, slender than frons, with one small inverted dark yellow triangle below the antenna, median portion pale yellow and the remaining pale brown. Setae: lower fronto-orbital plate with short brown setae extended from fronto-orbital setae to insertion of antenna; a pair of convergent pseudo-vibrissae developed, inserted on medial portion of face, half length of face; parafacial setae well developed, extended from mid length of face, shorter on upper portion and increasing in length toward buccal opening; face with transverse shallow furrows three of which deeper, one on dorsal third, one medial and one on basal third, giving a wavy appearance to face. Parafacial pale brown with whitish pruinescence; gena yellow with narrow band whitish pruinescence around eye margin; gena short and wholly setulose. Antenna: scape very short, whitish; pedicel velvet black with some short dorsal and marginal setae; first flagellomere orange, ovate, about 3 times longer than wide; arista bipectinate, with 13 dorsal and 4 ventral branches with some interspersed very short branches. Buccal structures pale brown; labrum small with whitish pruinescence; palpus short, ovate, setulose. Occiput and postgena brown. Compound eye with sparse short setulae between facets. Thorax (Figs 16, 18). Scutum dark brown with postpronotal lobe and postalar callus yellow; with silvery gray pruinescence; scutellum yellow. Setae: 2 postsutural dorsocentral; 2 notopleural; 1 postpronotal; 1 postsutural intra-alar; 1 post-alar; all setae well developed; scutellum with one preapical and one sub-basal pairs long. Pleura brown, clearer than scutum, with sparse silvery gray pruinescence on some regions; 1 long katepisternal seta and some small setae on ventral half of katepisternum; 1 propleural developed. Wing (Fig. 19) dark gray tinged, pale gray anal margin and one transverse narrow hyaline band at distal third extended from anterior margin to middle of cell M1, yellowish basally and one small yellowish spot on crossvein r-m. Legs short and robust; coxae and femora brown, tibiae brown with medial ring and apices yellow, tarsomeres 1–2 pale yellow and 3–5 pale brown. Fore femur with long robust setae on posteroventral margin; mid coxa with a comb of black strong setae on anterodistal margin; apicoventral spine of mid tibia developed; mid tarsus with ventral black spines on tarsomeres 2–4. Abdomen pale brown; short, ovate, wider on segments 2–3; setae short; tergite 6 slightly longer than the remaining tergites. Terminalia (Fig. 23): syntergosternite 7 narrow; sternite 8 wide and shallowly concave on posterior margin, posterior margin more sclerotized; tergite 8 widened; cercus small. Male. As in the female except the general coloration of body slightly darker: frons brown with lateral margin yellow; scutum dark brown to black; pleura brown; katepisternal setae 2–3; abdomen dark brown. Terminalia (Figs 20–22): epandrium low, shallowly concave; postgonites long and slender, bar like; ejaculatory apodeme short and wide, basal process of length of ejaculatory apodeme; phallus long, strongly dilated basally and enlarged distally


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with truncate tip, dense small hairs along dorsal surface; cerci very large with dense long setae, also rounded in posterior view. Type material. Holotype ♀ (USNM) labeled: “Porto Bello/ Pan Mar 1911/ August Busck (small white label); “Type no. 43127 U.S.N.M. (red label); Marbenia peculiaris Det. J. R. Malloch (large white label). Condition of type: good except the ocellar setae lost, medial vertical setae laid flat over compound eyes and frons, left orbital seta lost; scutum and scutellum with a dorsal longitudinal rip; anterior notopleural seta lost. Other material examined: BOLIVIA, Santa Cruz Dept.: Ichilo Prov., Hotel Flora y Fauna, 4–6 km SSE Buena Vista, 1729.95'S, 6333.15'W, 400–500m, 11 November 2003, N. E. Woodley (1♂; USNM). ECUADOR, Orellana: Res. Etnica Waorani (039.4'S, 7627.2'W; 216m, lot# 953), 8 Feb 1995, T. L. Erwin (1♀; USNM); (039.4'S, 7627.2'W; 216m, lot# 981), 9 Feb 1995, T. L. Erwin (1♂; USNM); (039.4'S, 7627.2'W; 216m, lot# 1693), 1 Oct 1995, T. L. Erwin (1♀; USNM). BRAZIL, Par: Viseu Faz. Ema – Mata, 24.xi–7.xii.1999, 5221ʹ29.6ʺS, 0125ʹ03.5ʺW, Armadilha Suspensa, I.S. Gorayeb, T. Pimentel, R.N. Bittencourt, J.O. Dias (1♂; MPEG).

FIGURES 16–19. Marbenia peculiaris Malloch: 16, habitus, lateral view; 17, head, frontal view; 18, dorsum of thorax; 19, left wing, dorsal view.



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FIGURES 20–23. Marbenia peculiaris Malloch: 20–22, male terminalia: 20, posterodorsal view of epandrium and internal terminalia; 21, same, lateral view; 22, ejaculatory apodeme, lateral view. 23, Female terminalia: posteroventral view. Figures 20 and 21 in the same scale. Scale = 0.3 mm.

Distribution. Bolivia, Brazil, Ecuador, Panama. Remarks. Marbenia peculiaris is easily distinguished from all species of Marbenia by the following characters: face and frons brown, wing predominantly brownish and male cercus large and bearing long setae.

Acknowledgments We thank Dr. Orlando Tobias Silveira (MPEG) who kindly loaned some of the specimens used in this study; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the support to the first two authors through the fellowship and grant provided to the project Sistemática morfológica de Hybotidae (Diptera, Empidoidea) com ênfase nas espécies neotropicais de Ocydromiinae e Hybotinae, Edital Universal n. 471616/ 2011-7, as well to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Fundação de Amparo Pesquisa do Estado do Amazonas (FAPEAM) by the grant provided to the project Incremento do conhecimento da diversidade, formação e fixação de especialistas em Sistemática de Diptera (Insecta) na Amazônia. We are also grateful to two anonymous reviwers who made useful suggestions on the manuscript.


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