172 



Orthorrhapha brachycera. 



lamellæ a little shining. Legs quite black or brownish black; coxæ 

 grey pruinose. Front femora with somewhat strong hairs on the 

 posterior side, and with fine hairs below, which are long towards 

 the base; middle femora with bristles on the anterior side, and with 

 finer hairs on the antero- and postero-ventral side; hind femora with 

 long hairs above and below, longest but less dense on the latter 

 side; front tibiæ with a double row of long and strong bristles above, 

 very long towards the apex, and with fine hairs below; middle tibiæ 

 with bristles on the various sides; hind tibiæ with hairs below, and with 

 long bristles on the dorsal, antero-dorsal and antero-ventral side. The 

 front femora somewhat thickened, and the front tibiæ thickened to- 

 wards the apex and considerably shorter than the 

 femora, metatarsi much thickened, fully twice as thick 

 as the end ot the tibiæ, somewhat ovate; they have 

 long, bristly hairs below towards the anterior side, 

 otherwise they are short-haired, the hairs above a little 

 longer, especially towards the apex, and there is gener- 

 ally a longer hair at the apex, and sometimes a bristle 

 towards the base; the metatarsi are as long as tibiæ, 

 in large and strong specimens even longer, and they are 

 longer than the four following joints, which are short, 

 about as broad as long. The hairs and bristles are 

 black, the short hairs on the front metatarsi may be 

 brownish. Wings almost hyaline. Veins black or blackish 

 brown; the upper branch of the cubital vein diverging, 

 not curved at the apex. Stigma blackish brown. Halteres 

 yellow. 



Female. Similar to the male, but the legs shorter 



haired, and the bristles on the dorsal side of the front 



tibiæ not specially long; front metatarsi simple, half as long as tibiæ 



and as long as the three following joints; third and fourth joint on 



the anterior tarsi about as broad as long. Hind tibiæ simple. 



Length 3 — 4 mm. 



This species is easily known in the male by the strong bristles 

 on the front tibiæ and the thick and large front metatarsi, and in 

 both sexes by the yellow halteres. 



H.pilipes is somewhat common in Denmark; Amager, Charlotten- 

 lund, Boserup et Roskilde; on Fænø; in Jutland at Nymindegab, 

 Tipperne at Ringkjøbing Fjord, Struer, Sæby and Frederikshavn, and 

 finally on Læsø; my dates are V»! to August. The species seems to 

 occur exclusively at or near the shore, or at all events on sandy 

 piaces, all my localitles are at the shore, or when not just at the 



Fig. 64. 

 H. pilipes, 

 front leg. 



X 30. 



