142 Oi'thorrhapha brachycera. 



ventral, apical and outer half of the dorsal edge; at the end there 

 are some teeth with black, curved hairs; the ventral margin has few, 

 soniewhat short hairs, and on the inside fine, paler hairs, which are 

 curved inwards. Legs yellow, front coxæ whitish pruinose anteriorly, 

 posterior coxæ grey with yellow apex; anterior tarsi with the apex 

 of nietatarsus and the four foUowing joints black, middle metatarsus 

 often more or less darkened to quite black; hind tibiæ slightly 

 darkened at the apex and hind tarsi black. The middle tibiæ are 

 somewhat long and thin, longer than the femora. The legs have 

 short, black hairs, front coxæ white-haired anteriorly on the outer 

 part; hind femora with a little longer hairs above towards the base, 

 and inconspicuously pale-haired below; posterior femora with one 

 preapical bristle; front tibiæ with bristles above and one or two 

 postero-ventral bristles; middle tibiæ v^^ith four to five antero-dorsal 

 bristles (one of them somewhat dorsal), two postero-dorsal, and with 

 one ventral bristle below the middle; hind tibiæ with two dorsal 

 rows of bristles, one ventral bristle towards the apex, and a ventral 

 row of small bristles; hind metatarsi with about two dorsal, one 

 anterior, and with small ventral bristles. Wings a little greyish or 

 yellowish tinged; veins black or blackish; discai vein with a some- 

 what small, obtuse bend; axillary lobe large, anal vein going a little 

 downwards. Squamulæ yellow with a black fringe. Halteres yellow. 



Fig. 44. Antenna of D. simplex 9, from the inside. X 65. 



Female. Epistoma broad, yellowish grey. Antennæ slightly shorter 

 than in the male. Front coxæ more black-haired ; for the rest similar 

 to the male. 



Length 4 — 4,5 mm. 



This species may be known from notabilis, caligatus and lineato- 

 cornis, besides by other characters, by the basal joints of the antennæ 

 being quite yellow, or at all events more yellow than in the named 

 species; with regard to the males notahilis has a long hair at the tip 

 of the front tibiæ, and caligatus and lineatocornis have differently 

 coloured epistoma and longer hairs below the hind femora. On the 

 other hånd the female of simplex shows very great resemblance to 

 the female of plumipes; it will, however, be distinguished by the 



