Oxysarcodexia favorabilis (Lopes, 1935)

(Figs 111–113)

Sarcophaga favorabilis Lopes, 1935: 318; Brazil, Rio de Janeiro, Angra dos Reis. Holotype male in MNRJ.

Diagnosis. Male. Length 8.0–9.0 mm. Postocular plate with golden pollinosity. Ocellar bristles well developed. Thorax with golden pollinosity, contrasting with the silvery pollinosity of the abdomen, T5 with only silvery pollinosity. Three well-differentiated post-sutural dorsocentral bristles. Apical scutellar bristles absent. Legs dark brownish. T3 with 2 pairs of lateral marginal bristles, T4 with 1 pair of median marginal and 3 pairs of lateral marginal bristles. ST5 with deep median cleft with margins almost parallel and with pilosity. Cercus bent backwards, with pointed apex and straight margin. Cercus with bristles ventrally absent only on middle portion. Cerci with distal third narrower than middle part in posterior view; parallel. Pregonite with base and apex of almost same width; unicolorous. Postgonite with expanded base and sudden narrowing at apex; unicolorous. Distiphallus with smooth ventroapical margin, square/oblong apex, sinuous dorsal outline, large dorsoapical swelling, ventroapical projections, lateral lobes and lateroapical expansions. Vesica symmetrical; distal lobes well developed, with filaments, tapering, membranous, with spines.

Remarks. Oxysarcodexia favorabilis (Fig. 112) resembles O. liliarum (Fig. 164), O. maiae sp. n. (Fig. 167) and O. mineirensis (Fig. 180) by the shape of the distiphallus and the distally enlarged juxta. These species are properly distinguished by the dorsal phallic outline, which is more curved in O. favorabilis than in O. liliarum, and with a subtle angle in O. maiae sp. n. and O. mineirensis . The ventroapical projections the distiphallus and the shape of the cercus also differ in these species: in O. favorabilis the ventroapical projections are longer and directed upwards and the cercus is slightly curved with a darker tip directed posteriorly, whereas in O. liliarum the ventroapical projections, in lateral view, resemble a notch with darker edges and the tip of cercus, although also darker, is directed anteriorly. The cercus of Oxysarcodexia mineirensis also has a darker tip and is curved in a smooth s-shape, whereas O. maiae sp. n. has a unicolorous cercus less curved than in the other species. These last two species have similar ventroapical projections of the distiphallus, but the vesica of O. mineirensis is narrower and longer than that of O. maiae sp. n. The holotype of O. favorabilis is somewhat damaged and in suboptimal condition for assessment of the pollinosity of the thorax and abdomen. See also remarks under O. ariozanoi sp. n. and O. augusta . Female unknown.

Distribution. NEOTROPICAL. Brazil (Rio de Janeiro).

Biology. Unknown.

Type material examined. Holotype ♂: [Brazil] Angra dos Reis, Est. do Rio, Dario Mendes 8-934 / Holotype / Typus / Sarcophaga favorabilis Lopes H. S. Lopes DET. —935 / MNRJ/2307 [MNRJ] .