Nemomydas Curran

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 : 98-100

Genus Nemomydas Curran

Nemomydas Curran, 1934: 165 (in key). Type-species, Leptomudas pantherinus Gerstaecker (orig. des.).

Head in anterior view one and one-half times as broad as high; face at antennae about one-half width of head; oral margin at about three-sevenths distance from lower eye margin to antennae. Stem of proboscis usually slender, labella attached at the apex, length of proboscis including labella varies from about one-half length (obsolete) to about two and one-half times the length of oral cavity (Figs. 8-9, 11); palpi short, about two times as long as wide, apical half narrowed in some species. Antennal segment 1 cylindrical and about one and one-half times as long as wide; 2 about one-third length of 1 and about two times as broad as long; 3 slender and varies from two to four times as long as 1-2; club usually widens from the base to the apical three-fourths where it is about one-fourth as wide as long, it is longer than segment 3 but does not always appear to be longer (Figs. 27-28).

Mesonotum with dense semi-erect hairs on lateral and posterior margins and in the dorsocentral rows varying to sparse short recumbent hairs especially in the females; these areas varying from bare to densely pollinose. Scutellum and arms bare. Postscutellum smooth, sparsely or densely pollinose, bare. Epimeron-1, pteropleura, laterotergite, and metasternum pilose, katepimeron pilose in a few species; usually dense on pteropleura and laterotergite but very short and sparse in some females.

Abdominal tergite-1a slightly rounded, densely pilose; Ip with dense, long, erect pilosity in males, pilosity very short and sparse in some females; anterior lateral margin of 2 with long hairs, dorsum of 2 and remaining tergites with dense, semi-erect hairs in males but a few species with long hairs on all tergites; females with short, sparse, recumbent hairs on 1-4, 5-8 with short and erect or retrorse hairs, becoming more numerous apically; bullae (Fig. 52) oval and from two to four times as long as broad. Male sternites with sparse, semi-erect hairs becoming more numerous apically, a few long hairs on 8, which is about one-eighth the length of 7; females with sparse erect hairs on 2-4, more numerous retrorse hairs on 5-8; 9 with circlet of strong, blunt spines. Male genitalia (Figs. 113-115): hypandrium completely coalescent with basistyli, the resulting structure roughly subrectangular, apical processes of gonopods thick, bifid apically, ventral tooth longer than dorsal tooth, when seen in lateral view; aedeagus usually long and slender, dorsally bent; cerci and epandrial halves coalescent at base, the latter for almost half their length; epandrial halves triangular; entire genitalia with many moderately long hairs, especially on the gonopods. (See also Hardy, 1950: pl. 2, fig. 23, for good illustrations).

Fore and middle legs short and slender. Hind femora slender, about eight times as long as wide; venter with 12 or more sharp spines; hairs usually short, long and erect on dorsum of some males. Hind tibiae cylindrical, apex with three or more long bristles. Hind metatarsus about three times as long as broad and subequal in length to segments 2-3.

Alulae with sparse fringe of short, fine hairs. Wings about three times as long as broad; second submarginal cell closed; first posterior cell open or closed; posterior crossvein absent; ambient vein weak; axillary lobe about two times as long as broad.

Length: 12-23 mm.

Geographic range: Canada (British Columbia) to Panama.