Mesembrinella brunnipes Surcouf, 1919

Whitworth, Terry L. & Yusseff-Vanegas, Sohath, 2019, A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea), Zootaxa 4659 (1), pp. 1-146 : 119-120

Mesembrinella brunnipes Surcouf, 1919

( Figs 65–66, 155–156, 220, 263, 307, 351, 392, 436, 488)

Mesembrinella brunnipes Surcouf, 1919: 78 . Lectotype female (MNHN), not examined. Type locality: Bolivia. [NB: Guimar „es (1977) noted that Surcouf did not select a holotype, so he designated a lectotype from one of three conspecific female syntypes from Bolivia.]

Mesembrinella brunnipes: Peris & Mariluis (1984: 260) ; Kosmann et al. (2013: 78); Wolff (2013: 121); Marinho et al. (2017: tab. 1); Cerretti et al. (2017: tab. 2).

Diagnosis. A fairly large brown fly averaging 12 mm (11–13/3) in length. Postpronotal lobe 3x 3; stem vein bare dorsally; wing infuscated; dorsum of abdomen without pits; supravibrissal setae dark brown or black; subcostal sclerite setose; section IV of wing 0.31 of section III; mid and hind femora with basal 1/4–1/2 brown, apical 1/2–3/4 orange; whitish tomentum on abdomen uniform on T1+2–4 vs. the similar M. townsendi , which has pale tomentum in oblique streaks. This species resembles M. bicolor , but has wing with strong, dark infuscated area along costa to R 2+3 instead of wing hyaline with yellowish area along costa.

Redescription. Male. Head. Frons 0.02/1 of head width at narrowest. Fronto-orbital and parafacial pale orange with pale tomentum, frontal seta ascending about 1/3 of distance to vertex; frontal vitta orange, obliterated in upper 2/3; gena: anterior half orange with pale orange tomentum, posterior half orange with silvery tomentum; postgena orange with silvery tomentum; gena and postgena with dark setae, except rear edge of postgena with pale setae; occiput with pale gold tomentum and pale gold setae; median occipital sclerite shiny dark orange; antenna dark orange; palpus typical; eye with median facets about 3x size of lateral facets; ocellar triangle small with ocelli about equal in size; supravibrissal setae dark, ascending about 1/5 of distance to antennal base.

Thorax. Dorsum shiny brown with pale tomentose stripes; pleura dark reddish with pale tomentum; chaetotaxy: ac 2:3, anteriormost postsutural setae may be lacking on one side, dc 2:3, ia 1, ph 1, ppn 3x 3, kat 1:1 or 2:1, meral setae typical, 1 ap converging slightly, sa absent, 2 very weak lat, 1 stout bas, 1 weak pb, 1 disc; subscutellum moderately developed; spiracles medium, pale yellow; legs brown except mid and hind femora with apical 1/4–1/2 orange. Wing heavily infuscated along anterior edge from costa to R 2+3; subcostal sclerite with dark setae; basicosta and tegula orange; section IV 0.31 (0.303 –0.313 /3) of section III; discs of calypters light tan; rim of upper calypter light tan with short reddish setae; rim of lower calypter yellow with long pale-yellow setae.

Abdomen. T1+2 yellow-brown, T3–5 purple-blue with pale tomentum, row of marginal setae on T4; T5 without marginal setae. Terminalia in lateral view with surstylus moderately curved backward ( Fig. 65); in posterior view cerci short and stout ( Fig. 66); phallus in lateral view with tiny, short epiphallus ( Fig. 155); in dorsal view, hypophallic lobes rectangular with prominent coarse serrations along edge ( Fig. 156); T6, STS7+8, pre- and postgonite, ejaculatory sclerite, ST6 and hypandrium as in Fig. 220; ST1–5 broad, as in Fig. 263.

Female. Similar to male except frons 0.27 (0.26–0.28/2) of head width at narrowest. T6 of WV shape; T7 slen- der, divided midway; T8 as separate sclerites ( Fig. 307); ST6–8 and hypoproct as in Fig. 351; spermathecae filiform ( Fig. 392); ST1–5 as in Fig. 436.

Type material examined. PARALECTOTYPE: Bolivia. ♀ *, “ Bolivien,” [only country listed] ( USNM) .

Additional material examined. Bolivia, La Paz. 1 ³♦* ( TLW430 ) , Sud Yungas, Puente Villa, Hotel Tamam- paya, 4300 ft, 19–24–1989, Flight intercept trap, J.E. Eger ( FSCA) ; Peru, Cusco. 1 ♀ ♦* ( TLW429 ) , Paucatambo , Puente , San Pedro 50 km NW Pilocapata , 3.ix.1988, 1600 m, A. Freidberg ( LACM) ; 1♀, Cock-of-the Rock Lodge, Loop Trail , 13°3ʹ21ʺW 71°32ʹ46ʺW, 1450 m, 6.xii.2011, dung bait, debu00340874, S.A. Marshall ( UGG) .

Distribution. Bolivia, Peru.

Remarks. Two specimens ( TLW 429–430) were barcoded, and clustered together ( Fig. 488).