Dolichogaster Macquart

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 : 81-83

Genus Dolichogaster Macquart

Dolichogaster Macquart, 1848: 178 (sep., p. 18). Type-species, Mydas brevicornis Wiedemann (mon.).

Head in anterior view one and six-tenths as broad as high; face at the antennae slightly less than one-half width of the head; oral margin at about one-third distance from lower eye margin to the antennae. Proboscis similar to Messiasia ) labella about three-fourths length of oral cavity; palpi very small. Antennal segment 1 slightly broader at apex than at base, its length subequal to width at apex; 2 about one-half length of 1 and one and one-half times as broad as long; 3 subequal in length to 1-2, apex about two times as broad as base; club slightly longer than 1-3, at basal one-fourth about three-fifths as wide as long (Fig. 14).

Mesonotum with short sparse semierect hairs on lateral margins and on dorsocentral stripes, mostly anteriorly. Scutellum bare of hairs, a few short erect on arms. Postscutellum rugose, bare of hairs. Pleura with hairs on episternum-1, pteropleura and metasternum.

Abdominal tergite-1a tuberculate, bare; 1p with sparse long erect hairs; remainder with quite numerous short recumbent hairs which on the apical segments arise from tiny punctures; bullae about three times as long as broad (Fig. 45). Sternites with quite numerous short recumbent hairs; a sternite 8 about one-half as long as 7 with dense longer hairs. Female with apical hairs. Male genitalia (Figs. 76-78): hypandrium completely coalesced with basistyli, the resulting structure short, trapezoidal; apical processes of gonopods very short, bent inwards, well sclerotized, black, and pointed apically; this beak is especially distinct in lateral view; aedeagus with a basal triangular bulb, and a long, slender neck [see d'Andretta & Carrera, 1951: figs. 19, 20, 18 (lateral view of aedeagus), 21 (apical processes of gonopod) J; anal lamellae and cerci long, oblongate, with very long bristle-like hairs; the cerci not coalesced; epandrial halves evenly rounded in their outer side, placed together, their inner sides straight, and the halves coalesced only for a short distance at the base; outer margin of epandrium with strong bristle-like hairs; wing-like expansions of aedeagus short, limited to the ventral bulb.

Fore and middle femora swollen and about two times as wide as their tibiae. Hind femora strongly swollen, about four times as long as wide; about 20 tuberculate spines on venter; hairs short, numerous, semierect. Hind tibiae with ventral keel; apex with sharp spur subequal in length to width of metatarsus, one bristle arising at middle of spur, one at base of spur and two or three more at apex of tibiae. Hind metatarsus nearly three times as long as wide and subequal in length to segments 2-3.

Alulae with fringe of dense squamose hairs. Wings about two and one-half times as long as broad; second submarginal cell closed and petiolate; first posterior cell at times closed and petiolate, or narrowly open; posterior cross-vein absent; ambient vein weak; axillary lobe about one and one-half times as long as broad..

Length:

20-27 mm.

Geographic range:

Brazil, Paraguay.