Planinasus nigrifacies Mathis, Rung & Kotrba 2012

Moderately small to medium-sized flies, body length 2.50–3.50 mm. Head: Head ratio 0.64–0.66; frons generally brownish black to black, mostly very finely and sparsely microtomentose, subshiny to shiny, except for densely microtomentose, velvet-like anterolateral angles and anterior margin; anterolateral angles setulose; frons wider than long, frontal ratio 0.45–0.47; interfrontal seta shallowly curved, elongate, length subequal to length of lateral vertical seta. Antenna black; basal flagellomere variable but usually short, length usually not exceeding height at base, tapered to moderately acute point at apex, both dorsal and ventral margins nearly straight to very shallowly depressed dorsally and arched ventrally; pedicel with ventral projection short, length of projection conspicuously less than length of pedicel without considering projection, bearing long, ventroapical seta (extended slightly beyond apex of basal flagellomere), 1 dorsal seta, 1 dorsomedial seta, 1 medial seta; arista bearing 13–14 dorsal rays, 3–4 ventral rays. Face comparatively narrow, facial ratio 0.45–0.48; dorsad of transverse carina sparsely microtomentose, subshiny to shiny, mostly brownish black to deeply bluish black; ventrad of transverse carina densely microtomentose, silvery white, sericeous; large facial setae arranged in 2 transverse rows of 6 setae; medial pair of dorsal row widely separate, shallowly dorsoclinate; next 2 setae shallowly ventroclinate; ventral row of facial setae all ventroclinate. Clypeus black with whitish gray microtomentum; palpus brownish black. Thorax: Mesonotum generally brownish black to deep bluish black, thinly microtomentose, subshiny to shiny; postpronotum brown, some specimens with some yellowish coloration around margin; area from postpronotum and through notopleuron at most finely and thinly microtomentose, subshiny to shiny; pleural areas finely microtomentose, subshiny, blackish brown; anepisternum mostly bare but with 2–3 setulae along posterior margin; katepisternum generally setulose, bearing 2 setae toward dorsal margin. Wing without pattern, generally infumate with some areas more hyaline. Coxae generally brown to brownish black with gray to whitish gray microtomentum; midcoxa with medial portion yellowish, lateral portion blackish brown; trochanters yellowish brown; femora and tibiae uniformly brownish black; forefemur lacking a preapical annulus; tarsi mostly yellowish basally, apical 2–3 tarsomeres becoming darker; forefemur bearing 1 seta at apical 1/3 along posteroventral surface. Abdomen: Uniformly blackish brown, mostly dull to faintly subshiny, moderately invested with microtomentum. Male abdomen: Tergites 1+2–6 well developed, lengths of 3–6 subequal; tergite 7 well developed but narrow, band-like; sternites 3–5 well developed, rectangular, wider than long, lateral margins shallowly arched; sclerotized posterior margin of sternite 5 shallowly incised medially; sternite 6 apparently lacking; sternite 7 moderately well developed, much wider than long, but not fused with tergite 7 to form an annulus. Male terminalia (Figs 87–89): Epandrium in lateral view (Fig. 87) trapezoidal, higher than wide, narrowed dorsally, anterior margin nearly straight, posterior margin straight on dorsal 2/3 thereafter ventrally forming a robust truncate extension; surstylus almost as long as epandrium, extended from ventral margin of epandrium in nearly oblique alignment with it, in lateral view (Fig. 87) elongate, robustly developed basally, distinctly tapered, apex recurved, anterior margin deeply arched, posterior margin swollen medially, apical 1/4 tapered to moderately acute point, partially recurved, bearing medial, elongate setula from posteromedial extension; hypandrium in ventral view (Fig. 88) moderately robustly U- to V-shaped, posterior margin U-shaped, anterior margin truncate, arms tapered toward attachment with epandrium, anterior portion robustly developed with lateral margins nearly straight; postgonite in ventral view (Fig. 88) convoluted, with relatively short lobe bearing apical setula, in lateral view (Fig. 89) with lobe very shallowly extended, bearing 3 apical, short setulae; phallus in ventral view and lateral views (Figs 88, 89) mostly membranous and difficult to discern; phallapodeme in lateral and ventral views (Figs 88–89) elongate, irregularly parallel sided, truncate apically; ejaculatory apodeme greatly reduced.

(Fig. 90). Neotropical: Brazil (Minas Gerais, Rio de Janeiro, São Paulo).