Brachylinga xanthoperna Irwin and Webb

Webb, Donald W. & Metz, Mark A., 2006, A Revision of the New World Genera Brachylinga Irwin and Lyneborg and Lysilinga Irwin and Lyneborg (Diptera: Therevidae: Therevinae) with the Description of a New Genus, Elcaribe Webb, Zootaxa 1288 (1288), pp. 1-241 : 143-146

Brachylinga xanthoperna Irwin and Webb

( Figs. 24, 47, 70, 93, 116, 139, 162, 185, 206, 213)

xanthoperna Irwin and Webb (1992:91 orig. desc., 111 Figs. 11–16 fem. frons, ant., max. palp., wing, genit.) ( Brachylinga ). Type locality Brazil, Roraima, Rio Uraricoera, Ilha de Maracá. Holotype female in INPA.

Diagnosis

Brachylinga xanthoperna is taxonomically associated with B. curacaoensis and B. fraterna in having the postocular, mesonotal, and coxal macrosetae dark reddish brown; in having the male parafacial silver or gray over entire surface; the male frons lacking setae; the halter knob yellow; in having the wing cell m 3 closed; the maxillary palpus pale yellow or at most with basal half reddish brown; and the male tergite 8 ( Fig. 24) narrow (<0.05 mm). Brachylinga xanthoperna differs from B. fraterna and B. curacaoensis in having the posterior margin of the hypoproct cone­shaped ( Fig. 24) and the gonocoxite in lateral view ( Fig. 93) attenuate apically. It differs from B. fraterna in having the basal half of the gonocoxite in ventral view ( Fig. 47) quadrate, the median margin rounded, then tapering apically to attenuate projection.

Redescription of male

Variation (n=6).

Body length 5.3–6.3, 5.8 mm.

Head. Ommatidia smaller ventrally and laterally. Frons pruinescence white, black dorsally as pair of triangles; setae absent. Antenna with scape black, pruinescence gray, pedicel and first flagellomere dark yellow, second and third flagellomeres dark brown; setae on scape black. Parafacial pruinescence silver to gray. Maxillary palpus yellow; setae pale yellow. Genal setae white. Occipital setae white becoming lanceolate, appressed dorsally. Postocular macrosetae dark reddish brown.

Thorax. Macrosetae dark reddish brown, 3 np, 2 sa, 1 pa, 2 dc, 2 sc. Mesonotum brownish gray; setae black, short intermixed with white, lanceolate, appressed setae. Pleuron pruinescence gray; setae white on propleuron, anepisternum, laterotergite, metanepisternum, and scutellum, absent on katepisternum. Wing. Membrane pale brown; veins brown, Sc and R 1 yellowish brown; pterostigma dark yellow; cell m 3 closed, petiolate. Halter knob pale yellow, stalk yellowish brown. Legs. Coxa setae white, present on posterior surface of midcoxa; macrosetae dark reddish brown. Forefemur pale reddish brown, midfemur dark yellow, hindfemur dark yellow, apex dark brown; ventral setae white on fore­ and midfemora, dark brown setae apicoventrally on forefemur; av 0:0:3–4, pv 0:0:2–8. Tibiae dark yellow, apex reddish brown. Tarsomeres 1–2 dark yellow, apex dark reddish brown; 3–5 dark reddish brown.

Abdomen. Tergite 1 black, tergites 2–3 dark brown laterally, black anteromedially with white posterior margin, tergites 4–6 black with white posterior margin; dorsal setae dark brown on dark areas of tergites 2–6 becoming white, appressed posteriorly; lateral setae white, erect. Terminalia (MEI 048100) dark brown. Tergite 8 ( Fig. 24), narrow medially (0.02 mm); setae yellow, elongate, continuous across posterior margin. Sternite 8 ( Fig. 47), sides rounded, posterior margin emarginate; setae pale yellow. Epandrium ( Fig. 24), sides rounded; setae dark brown. Cercus ( Fig. 24), ending basal to apex of hypoproct. Hypoproct ( Fig. 24), posterior margin rounded, ending distal to apex of cercus. Gonocoxite ventral view ( Fig. 47), basal half quadrate, rounded laterally, median margin rounded, tapering apically to attenuate projection; setae dark yellow, apical macrosetae dark brown; dorsal view ( Fig. 70), posteromedial lobe short, gonocoxal bridge absent; lateral view ( Fig. 93) attenuate apically; ventral lobe ( Fig. 47) with ventral spines. Gonostylus ( Fig. 116), basodorsal lobe large, rounded; ventral margin sinuate, setae dark yellow, not directed apically in distinct tuft; fine short spines absent laterally. Aedeagus with dorsal apodeme ( Fig. 139) broad, rectangular, posterolateral margin rounded; ventral apodeme ( Fig. 162) tapered anteriorly, not extending to margin of dorsal apodeme; distiphallus dorsal view ( Fig. 139) tapered apically, lateral view ( Fig. 185) broadly curved ventrally with apicolateral spines; ejaculatory apodeme ( Fig. 139), anterior margin truncate.

Female

Similar to male except for following.

Variation (n=10).

Body length 5.8–7.5, 6.8 mm.

Head. Frons pruinescence yellowish brown, extending ventromedially to antennal base, ventral fourth silver with large, dark brown circle dorsolaterally; setae dark brown, short. Parafacial pruinescence white.

Thorax. Macrosetae 3 np, 2 sa, 1 pa, 2 dc, 2 sc. Legs. Anteroventral macrosetae 0–2:0:3–7, pv 0:0:1–8.

Abdomen. Tergite 1 black, tergites 2–3 dark brown laterally, black anteromedially with white posterior margin, tergites 4–6 black with white posterior margin; dorsal setae dark brown on dark areas of tergites 2–6 becoming white, appressed posteriorly; lateral setae white, erect. Terminalia (MEI 121594). Furca ( Fig. 206) quadrate, posterior and anterior margins rounded; length 0.42 mm, width 0.26 mm; anterolateral projection short. Common duct ( Fig. 206) shorter than furca. Spermathecal duct ( Fig. 206) directed anteriorly.

Distribution Brachylinga xanthoperna is known from Brazil, Colombia, and Venezuela ( Fig. 213). Habitats and phenology

Brachylinga xanthoperna has been handnetted, collected in Malaise traps, and collected by fogging with an insecticide in June, September to December, and February to March.

Specimens examined

Type specimen. The holotype female of Brachylinga xanthoperna Irwin and Webb (MEI 006913) is labeled "Brazil, Roraima, Rio Uraricoera, Ilha de Maraca [­20.117, ­ 56.117], 20–30.III.1987, L. S. Aquino " and is in the INPA. Other specimens. BRAZIL. RORAIMA. Rio Uraricoera, Ilha de Maraca [­20.117, ­56.117], 20–30.III.1987, L. S. Aquino, 2♀ MEI 00691 ( MEIC) , 006915 (INPA), Malaise trap; 2–13.V.1987, J. A. Rafael, J. E. B. Brazil, L. S. Aquino, 1♀ MEI 006916 ( INHS) , Malaise trap; 21–30.XII.1987, J. A. Rafael, 1♀ MEI 006912 ( INPA) , insecticide (fogging). COLOMBIA. MAGDALENA. Santa Marta [11.26, ­74.2], 8.X.1971, G. E. Bohart, 1♂ MEI 007774, 1♀ MEI 007777 (E MUS) . VENEZUELA. ARAGUA. El Limon [9.93, ­67.02], 480 m, 27.II.1973, C. J. Rosales , 1♀ MEI 121566 ( MIZA) , Malaise trap; 19.II.1973, 2♀ MEI 121584, 121594 ( MIZA) . GUARICO. 12 km S Calabozo [8.812, ­67.43], 6–12.II.1969, P. & P. Spangler, 1♀ MEI 048157 ( USNM) ; Hato Masaguaral , 44 km S Calabozo [8.933, ­67.433], 3–10.V.1985, Menke, Carpenter, 1♂ MEI 048100 ( USNM) . MONAGAS. Uverito [8.7, ­ 62.583], 21.V.1981, C. J. Rosales , 1♀ MEI 121567 ( MIZA) , Malaise trap; 16.XI.1978, 1♀ MEI 121572 ( MIZA) . NUEVA ESPARTA. Las Marites [Laguna de Las Maritas] [10.917, ­ 63.917], 3.IX.1953, 1♂ MEI 045964 ( INHS) . ZULIA. Distrito Perija , 15.VIII.1967, Frómeth, 1♀ MEI 007457 ( MUCR) ; Maracaibo [10.648, ­71.64], 20.VII.1967, F. Avila, 1♂ MEI 007463 ( MEIC) ; Paraguaipoa [11.351, ­71.96], 11.XI.1971, J. Maldonado Capriles MEI 048200 ( USNM) .