Helophilus. 455 



haired; at the sides there are black hairs on the hinder half of second 

 and on third segment. Genitalia a little yeliowish pruinose, witii donse, 

 reddish iiairs; the hairs form a tuft on the right side and have their 

 apices curved to the right. Venter pale yellow, with a spot on first 

 segment an the fourth segment and the genitalia blackish grey; it is 

 clothed with long, pale hairs. Legs with anterior femora black with 

 about the apical third yellow, hind femora black with the apical third 

 or fourth reddish; anterior tibiæ yellow, the front tibiæ with the apical 

 part black; front tarsi quite black, middle tarsi with metatarsus and 

 the second joint except apex yellow; hind tibiæ yellow with about 

 the apical third black, hind tarsi black, broad and flat; the hind 

 femora are shorter and thicker than in the other species, and they 

 are thickest about the middle; hind tibiæ likewise shorter, more 

 strongly and more evenly curved. The hairs on the legs yellow, 

 behind the front femora mainly black; middle femora with short and 

 fme, black bristles below in the whole length; hind femora with black 

 hairs on the apical part on the anterior side, and black spinulose 

 beneath in nearly the whole length; middle tibiæ black-haired below 

 and hind tibiæ black-haired above on the yellow part and with very 



\ 



Fig. 157. Wing of H.pendtdus d". 



short, erect, black hairs below. Wings hyaline or slightly tinged 

 towards the anterior margin. Squamulæ and fringes dark yellow. 

 Halteres pale yellow. 



Female. Vertex and frons broader than in the male, evenly 

 widening downwards; vertex black and frons with a large elongated 

 black triangle above the antennæ, often reaching to the vertex as a 

 broader or narrower stripe; the hairs black above, yellow below in 

 varying extent, sometimes all black. The abdominal spots narrower 

 than in the male, especially those on third segment, and here not 

 lying close to the front margin, and the yeliowish or greyish yel- 

 low, somewhat pruinose spots at the inner end larger; fifth segment 

 with greyish yellow, somewhat pruinose spots similar to those on 



