Heteromydas Hardy
Creators: name: J. Wilcox
name: N. Papavero
Publisher: name: Zenodo
Year: 1971
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mydidae
Heteromydas

description: Genus Heteromydas Hardy
Heteromydas Hardy, 1944: 227, figs. 3a-f. Type-species, bicolor Hardy (orig. des.).
Head in anterior view one and four-tenths times as broad as high; face at antennae nearly one-half width of head. Oral margin at about one-third distance from lower eye margin to antennae; gibbosity with a central vertical groove. Proboscis similar to Messiasia J the labella as long as oral cavity; palpi slender and one-half the length of the oral cavity or more. Antennal segment 1 cylindrical, about one and one-half times as long as broad; 2 one-half length of 1 and slightly wider than long; 3 long and slender, about three times as long as 1-2; club about three-fourths length of 3, fusiform and at middle about one-third as wide as long (Fig. 16).
Mesonotum with lateral margins and dorsocentral stripes at times pollinose, including the central stripe and intermediate area anteriorly; hairs short. Scutellum with sparse long hairs on posterior margin. Postscutellum smooth, lateral slopes pilose. Pleura pilose on episternum-1, posterior margin of mesopleura, pteropleura and metasternum.
Abdominal tergite-1a slightly rounded, bare; 1-p with quite dense, short, erect, pilosity; remaining segments with sparse recumbent hairs; bullae slender and about five times as long as broad. Sternites with sparse semi-recumbent hairs becoming numerous on 7-8; 0' 8 nearly as long as 7; ~ segment 8 with dense erect hairs. Female with terminal circlet of strong spines. Male genitalia (Figs. 82-84): hypandrium free, small, bowl-shaped in lateral view, coalesced with the basal portions of the basistyli for a short distance; gonopods with apical processes slender, pointed to the interior of the genitalia; aedeagus long and very thick; anal lamellae and cerci slightly longer than aedeagus, cerci coalesced basally; epandrial halves triangular, free; postero-lateral margins of epandrium prolonged into a pair of elongated lobes; cerci and epandrium with moderately long hairs. The male genitalia of Heteromydas was also described and figured by Hardy [1944: figs. 3C (lateral view), 3E (ventral view), 3F (dorsal view) J.
Hind trochanters with 2-5 short strong spines. Fore and middle legs slender. Hind femora moderately swollen, a about six and ~ about seven, times as long as wide; venter with 16 spines slightly tuberculate; hairs recumbent, short and erect on dorsum. Hind tibiae with a ventral keel, apical spur slightly longer than width of metatarsus and with a basal bristle. Hind metatarsus about five times as long as broad and as long or longer than segments 2-4.
Alulae with a dense fringe of squamose hairs. Wings about three and one-half times as long as broad; second submarginal cell open; posterior crossvein present; axillary lobe nearly as broad as long; ambient vein complete.
Length, 22-29 mm.
Geographic range: U. S.A. (California), Mexico (Baja California).
Papavero & Wilcox (1968) placed Mydas chrysites Osten Sacken in Heteromydas Hardy, based on the identification and figures of Seguy (1928). This species was described from Northern Sonora (Mexico) and Johnson (1926) identified a specimen from Southern Arizona; Dr. Howard Evans, MCZ, confirmed that it belonged in Mydas Fabricius. The type was examined by the junior author in the BMNH, and proved to be a real Mydas. Specimens of both sexes have since been examined (from Southern Arizona) and they agree so well with the description, that it appears that Seguy (1928) was incorrect in his identification; he gave no locality for his specimens, but they probably represent an undescribed species of Heteromudas from Baja California.
description: Published as part of J. Wilcox & N. Papavero, 1971, The American Genera of Mydidae (Diptera), with the Description of three new Genera and two new Species, pp. 41-119 in Arquivos de Zoologia 21 (2) on pages 86-88, DOI: 10.5281/zenodo.154004