Brachylinga ornatifrons (Kröber)

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 : 102-104

Brachylinga ornatifrons (Kröber)

( Figs. 18, 41, 64, 87, 110, 133, 156, 179, 200, 213)

ornatifrons Kröber (1911: 499 male key, 519 orig. desc.; 1913:33 dist.; 1928a:6 dist., 10 male key) ( Psilocephala ); Metz et al. (2003:22 comb. change) ( Brachylinga ). Type locality Peru, Arequipa. Holotype male (MEI 134208) in SMTD.

Diagnosis

Brachylinga ornatifrons is taxonomically associated with B. laculata in possessing setae on the katepisternum; in having the halter knob dark reddish brown; and in having the foretibia dark yellow with the apex dark reddish brown. Brachylinga ornatifrons differs from B. laculata in having the wing cell m 3 closed, petiolate; tergite 8 ( Fig. 18) narrow medially; and the gonocoxite in dorsal view ( Fig. 64) lacking a gonocoxal bridge.

Redescription of male

Variation (n=7).

Body length 5.3–5.8, 5.5 mm.

Head. Ommatidia smaller ventrally and laterally. Frons pruinescence white, dark brown dorsally (generally darker laterally); setae dark brown, short. Antenna with scape dark brown, pruinescence gray, pedicel dark yellowish brown, first flagellomere dark yellowish brown, second and third flagellomeres dark brown; setae on scape dark brown, short. Parafacial pruinescence white. Maxillary palpus dark yellow; setae yellow. Genal setae white. Occipital setae white becoming lanceolate appressed dorsally. Postocular macrosetae dark reddish brown.

Thorax. Macrosetae dark reddish brown, 3 np, 1 sa, 1 pa, 0–2 dc, 2 sc. Mesonotum dull brown; setae black, elongate intermixed with dull gold lanceolate appressed setae becoming whitish gold laterally. Pleuron and scutellum dark reddish brown, pruinescence gray; setae white on propleuron, anepisternum, katepisternum, metanepisternum, laterotergite, and scutellum. Wing. Membrane pale smoky brown, veins brown; pterostigma pale brown; cell m 3 closed, petiolate. Halter brown. Legs. Coxa setae white, present on posterior surface of midcoxa; macrosetae dark reddish brown. Femora dark brown, pruinescence white; ventral setae white, elongate intermixed with dark brown setae on fore­ and midfemora; av dark brown 0–1:0:3–4, pv 0:0:1–3. Tibiae dark yellow, dark brown apically. Tarsomeres 1–2 dark yellow, dark brown apically; 3–5 dark brown.

Abdomen. Dark brown, pruinescence white; dorsal setae white, appressed; lateral setae white, elongate. Terminalia (MEI 045955) reddish brown. Tergite 8 ( Fig. 18), median length thick (0.05 mm); setae dark yellow, continuous across posterior margin. Sternite 8 ( Fig. 41) rectangular, sides rounded, posterior margin emarginate. Epandrium ( Fig. 18), sides tapered apically; setae dark yellow. Cercus ( Fig. 18) ending basal to apex of hypoproct. Hypoproct ( Fig. 18), posterior margin emarginate, ending distal to apex of cercus. Gonocoxite ventral view ( Fig. 41), broad, rectangular, medial margin sinuate, tapering apically to broad, truncated apex; setae dark yellow, black macrosetae along apical margin; dorsal view ( Fig. 64), posteromedial lobe small, rounded, gonocoxal bridge absent; lateral view ( Fig. 87) short, rectangular, posterior margin truncate; ventral lobe ( Fig. 41) with ventral spines. Gonostylus ( Fig. 110), basodorsal lobe moderately large; ventral margin straight, setae dark yellow, not directed apically in distinct tuft; fine, short spines absent laterally. Aedeagus with dorsal apodeme ( Fig. 133) quadrate, posterolateral margin rounded; ventral apodeme ( Fig. 156) tapered anteriorly, not extending to anterior margin of dorsal apodeme; distiphallus dorsal view ( Fig. 133) tapered apically, lateral view ( Fig. 179) broadly curved ventrally, apicolateral spines absent; ejaculatory apodeme ( Fig. 133), anterior margin truncate.

Female

Similar to male except for following.

Variation (n=3).

Body length 4.9–6.7, 5.6 mm.

Head. Frons dull brown, yellowish brown ventrolaterally with small, brown circle dorsolaterally; setae dark reddish brown, short, dorsally. Antenna dark brown, scape and pedicel pruinescence gray. Parafacial pruinescence gray.

Thorax. Macrosetae 3 np, 1 sa, 1 pa, 2 dc, 2 sc. Mesonotum dull brown; setae black, elongate intermixed with dull white, lanceolate, appressed setae. Legs. Anteroventral macrosetae 0:0:3, pv 0:0:3.

Abdomen. Dark reddish gray, pruinescence light gray, denser posterolaterally on tergites 1–4 and across posterior half of tergites 5–7; dorsal and lateral setae dark reddish brown, short with whitish gold, elongate, appressed setae across posterior margin of tergites 1–4. Terminalia (MEI 088214). Furca ( Fig. 200) quadrate; length 0.44 mm, width 0.16 mm; anterolateral projection short. Common duct ( Fig. 200) longer than furca. Spermathecal duct ( Fig. 200) diverging anteriorly.

Immature Stages. One female (MEI 045901) has been reared from larvae collected at Lambayeque, University Nacional Vedro Luis Gallo from soil; 1♂ (MEI 045900) and 1♀ (MEI 088214) have been reared from larvae collected at Lambayeque from soil; and 1♀ (MEI 040262) has been reared from a larva collected at Bodegones from soil .

Distribution Brachylinga ornatifrons is known from Peru ( Fig. 213).

Habitats and phenology Brachylinga ornatifrons has been handnetted from 2 February to 13 November.

Specimens examined

The holotype male of Brachylinga ornatifrons (MEI 134208) is labeled “Peru, 13.XI.02, Arequipa, Coll. W. Schnuse ” and is in the SMTD. Other specimens. PERU. AYACUCHO. Ica , 50 km E Nazca [­14.84, ­74.49], 2500 m, 10.III.1987, Karsholt, O., 1♂ MEI 077752 ( MEIC) . HUANUCO. Tingo Maria, Monson Valley [­9.275, ­76.01], 18.IX.1954, EIS, Ross, E. S., 1♂ MEI 147291, 1♀ 147290 ( CAS) ; Tingo [Tingo Maria], 16.VIII.–, Cockerell, 1♂ MEI 045945 ( USNM) . LAMBAYEQUE. Lambayeque, University Nacional Vedro Luis Gallo [­6.693, ­79.904], 29.IX.1989, MEI, 1♀ MEI 045901 ( MEIC) , sieved; Lambayeque [­6.7, ­79.91], 2.II.1990, 1♂ MEI 045900 ( MEIC) , sieved; 5.III.1981, 1♀ MEI 088214 ( INHS) ; Bodegones [­6.72, ­79.99], 2.IV.1975, MEI, 1♀ MEI 040262 ( MEIC) , sifted. LIMA. Chosica [11.94, ­76.7], –. XI.1961, Krauss, N. L. H., 1♂ MEI 045955–6, 1♀ 045954 ( USNM) ; Quilmana [­12.96, ­76.39], 400 m, 25.IX.1951, Aguilar, P., 1♂ MEI 045942 ( INHS) .