Plyomydas, J. Wilcox & N. Papavero, 1971

J. Wilcox & N. Papavero, 1971, The American Genera of Mydidae (Diptera), with the Description of three new Genera and two new Species, Arquivos de Zoologia 21 (2), pp. 41-119 : 106-107

Plyomydas , gen. n.

Head in anterior view one and one-half times as broad as high; face at antennae one-half width of head. Oral margin at one-fourth distance from lower eye margin to antennae. Proboscis similar to Messiasia ) labella about two-thirds length of oral cavity; palpi apparently very small (not visible). Antennal segment 1 cylindrical, nearly as broad as long; 2 one-half length of 1 and one and one-half times as long; 3 slender and one and six-tenths as long as 1-2; club one and four tenths as long as 3, at two-thirds its length about one-half as wide as long (Fig. 33).

Mesonotum pollinose, dense on humeri, lateral margins and dorsocentral stripes, hairs short and sparse on these areas. Scutellum pollinose with sparse hairs laterally and on arms. Postscutellum pollinose, rugose laterally, bare. Pleura thinly pollinose; sparse long hairs on episternum-1, pteropleura, and metasternum.

Abdominal tergite-1a oval, rounded, densely pollinose and bare; sides and base of 1p pollinose with sparse, semi-erect hairs, posterior margin bare; remaining segments with sparse, long, recumbent hairs; bullae (Fig. 55) small, about three times as long as broad. Sternites 2-7 with sparse, long, recumbent hairs, 8 about one-fourth length of 7 and with sparse, long hairs at apex. Male genitalia (Figs. 125-127): hypandrium completely coalesced with basistyli, resulting structure also capsular, with rounded lateral margins; a depression towards the aedeagus is seen in the middle of the fused gonopods; apical processes divided into 4 outgrowths, one ventral, which is the largest, and other three dorsal; outer ones intimately related; aedeagus with a dorsal spur which is the result of fusion of the dorsally bent lateral apodemes; epandrial halves triangular, united basally; cerci long, oblongate, united at base. Female terminalia similar to Mydas .

Fore and middle legs slender, femora slightly wider than their tibiae. Hind femora slender, about ten times as long as wide; venter with 2-3 sharp spines near apex and a fringe of long erect hairs; hairs otherwise short, sparse, semi-erect. Hind tibiae cylindrical with one or two apical bristles. Hind metatarsus about three times as long as broad and subequal in length to segments 2-3.

Alulae with dense fringe of squamose hairs. Wings about three and four-tenths as long as broad; second submarginal cell closed to narrowly open; posterior crossvein present; ambient vein complete; axillary lobe nearly as broad as long.

Length, 12-18 mm.

Geographic range: Peru.

Type-species, Plyomydas peruviensis , sp. n.