Dolichopodidae. 269 



pruinose, with pale hairs, which are longish towards the base, Hypo- 

 pygium blackish, the ventral lobes small, somewhat styliform, with 

 some short hairs below; the outer lamellæ short, lamelllform, on the 

 ventral or outer side they are prolonged into a somewhat long, recurved 

 process; the apical margin is a little serrated; they are brownish or 

 blackish brown, pale-hairy, longest at the margin. Legs with the coxæ 

 grey; front femora black with yellow apex, middle femora yellowish, 

 very slightly darker at the apex, hind femora yellowish with the 

 apical part black, the colour stretching somewhat inwards above; 

 anterior tibiæ and tarsi yellow, the latter with about the apex of 

 metatarsus and the four following joints brownish or blackish; hind 

 tibiæ and tarsi black; front metatarsi nearly as long as the four fol- 

 lowing joints, a little curved and thickened at the apex; middle me- 

 tatarsi likewise about as long as the four following joints, hind meta- 

 tarsi about of the length of the second joint. The legs have short, 

 black hairs, the coxæ white-haired ; posterior coxæ with a small, 

 black fringe at apex; front femora with long, pale hairs on the post- 

 erior side, middle femora with shortish, pale hairs below, hind femora 

 with a short, pale fringe below on the posterior side in the basal 

 half; middle femora with a pair of preapical bristles on both sides, 

 hind femora with one on the anterior side; tibiæ with two dorsal 

 rows of somewhat long bristles, middle tibiæ also with a pair of ventral 

 bristles below the middle, and hind tibiæ with small ventral bristles; 

 middle metatarsi with some short bristles below. Wings brown; veins 

 blackish, discai vein with a somewhat small, even curve; posterior 

 cross-vein rather oblique. Squamulæ yellow, with a white fringe. 

 Halteres yellow. 



Female. Epistoma broad, somewhat silvery; palpi large, grey. 

 Antennæ short, the third joint almost not longer than broad, the 

 arista more than twice as long as the antennæ. Legs with femora 

 yellow, front femora slightly dark at the apex, hind femora with black 

 apex; hind tibiæ black at the base, the apical part more or less 

 brownish, blackish towards the apex; anterior metatarsi about of the 

 same relative length as in the male, front metatarsi simple ; front 

 coxæ with a single black hair at the apex, middle coxæ with some 

 few ; front femora with longish, pale hairs on the posterior side, middle 

 femora with short, pale hairs below. Wings more brown than in the 

 male. 



Length about 5 mm. 



P. riparia is very rare in Denmark, only one specimen, a male, 

 has been taken in Jutland at Nymindegab on V« 1907 (Th. Mor- 

 tensen). 



