58 



Pipunculidae. 



shining but whitish or silvery pruinose on the upper 

 margin and the sides. Abdomen black, a little green- 

 ish or bluish and somewhat shining, shghtly pruinose, 

 first segment grey, second rather dulhsh black; ab- 

 domen is sparingly clothed with quite short black 

 hairs and has a conspicuous fan of longer hairs at 

 the sides of first segment. Venter with third and fourth 

 segments clothed with a curious, dense, brown velvety 

 pile. Hypopygium not large, somewhat pruinose, with a 

 large, somewhat oval apical impression, the end claws 

 reddish. Legs black with only just apex of femora and 

 base of tibiæ yellow; femora greyish pruinose but hind 

 femora shining behind; the legs haired as usual, the 

 posterior femora with a double row of very small spinules 

 below the apical part, hind trochanters unarmed, but 

 with a little roundish projection downwards, clothed 

 with a dense patcli of microscopical hairs. Wings nearly 

 clear, stigma absent, third costal segment about half 



as long as fourth or scarcely, middle cross-vein well beyond the 



middle of the discai cell. H alteres yellow. 



Fig. 28. 

 Antenna of 

 P. nigritu- 

 lus^ X112. 



Fig. 29. Wing of P. nigritulus (^ . 



Female. Similar, frons black and shining in the upper two 

 thirds, whitish grey above the antennæ. Venter not clothed as 

 in the male; hypopygium elongated ovale, black and shining, 

 pruinose at the base, ovipositor reddish, thin and straight, about 

 as long as the basal part. Hind trochanters as in the male; claws 

 and pulvilli not larger. 



Length 3 — 3,5 mm. 



As known Verrall considered his geniculatus and nigritulus Zett. 

 as the same species, but Colhn, who had studied Zetterstedt's types 

 of nigritulus has 1. c. shown, that this is not so and has given char- 

 acters for geniculatus. As mentioned by him it remains at present 

 uncertain which of these species may be the geniculatus of Meigen, 



