Empididae. 207 



bristle, all yellow; besides there niay be some smaller hairs. Scutellum 

 with eight to ten pale yellow marginal bristles. Pleura black, very 

 slightly pruinose. Abdomen black, shining, sometimes a little trans- 

 lucently brownish ; it is clothed with long, pale yellowish hairs, which 

 are a little longer at the hind margin of the segments. Venter 

 similarly coloured, a little shorter haired. Genitalia not large and not 

 swollen. Legs pale yellow; the coxæ, especially the posterior some- 

 what darkened, hind femora a little brownish, hind tibiæ and tarsi 

 brown, the tibiæ paler towards the base, anterior tarsi brownish, 

 pale at the base. Hind tibiæ somewhat thickened towards the apex, 

 and the metatarsi slightly thickened. The legs are densely and longish 

 haired, especially above and below, the hairs below the femora are 

 vertically erect; the middle femora have some bristles on the antero- 

 dorsal side, the middle tibiæ two rows of long bristles on the dorsal 



Fig. 84. Wing of L. flnvipes. 



side (with about three bristles in each row); the hind tibiæ have 

 some bristles on the dorsal side towards the apex. The hairs and 

 bristles are yellow to pale brownish. Wings slightly yellowish tinged. 

 Veins brown, No stigma present. Halteres yellow. 



Female. Differing from the male in colour; thorax yellow or 

 reddish yellow; abdomen yellow, but with broad, transverse, black 

 spots on the segments, so that it has only narrow, pale incisures, or 

 the spots quite confluent apd abdomen black, only with some triangular 

 lateral yellow spots; venter more or less pale. Ovipositor long, com- 

 pressed, curved upwards and sword-like. Legs as in the male or a 

 little paler. 



Length 4—5 mm. 



L.flavipes is very rare in Denmark and has only been taken a 

 few times many years ago, by Stæger in Charlottenlund. It occurred 

 in the middle of June, and was taken on Corylus avellana. 



Geographical distribution: — Europe down into Spain and Italy; 

 towards the north to northern Scandinavia, and in Finland; it occurs 

 also in North America. 



