Aphiochaeta. 313 



arista distinctly piibescent. Palpi dark yellow, of ordinary size and 

 armatiire. Thorax black, very slightly shining, with dark or blackish 

 brown pubescence. Mesopleura with uniform bristles, Abdomen some- 

 what robust, black, somewhat greyish above, dull; the short hairs 

 sparse, but distinct, slightly more conspicuous at the hind margins 

 of the segments; the hairs at the sides of the sixth segment longish, 

 especially at the hind margin. Hypopygium somewhat large and 

 knob-like, about as high as long, it is shining above at the base, greyish, 

 but on the sides the lower half is pale yellow; as far as I have been 

 able to see tliere is, on each side, a row of about six not strong bristles 

 or bristly hairs, stretching in an oblique or arched line from near the 

 lower anterior corner npwards and backwards, and some hairs more 

 anteriorly towards above; the bristles in the row increase in size 

 downwards, the lowermost being the strongest; further there is on 

 the right side below (or perhaps on both sides) just at the margin 

 of the apical aperture a bunch or series of erect hairs; ventral plate 

 yellow, large and square; anal tube of medium size, blackish or brown- 

 ish, with some hairs above, but without apical hairs. Legs dark brown, 

 the front legs paler and also posterior tibiæ and tarsi somewhat paler, 

 the last joint on all tarsi black; the hairs below hind femora a little 

 longish towards the middle, at the base there is a comb-like row of 

 short, strong bristles; bristles on hind tibiæ somewhat large, few in 

 number, about 10 or 11. Wings clear, thick veins blackish brown, 

 thin veins paler; costa not reaching to the middle, about 0,46 of the 

 wing-length, costal divisions about as 11 — 8 — 3; costal cilia full long; 

 fourth vein rather curved at the origin and then almost straight. 

 H alteres yellow. 



Female. Unknown. 



Length 1,7 mm. 



A. hypopygialis is a rare species, three specimens, all males, have 

 been taken; Suserup Skov at Sorø ^V? 1918 (Th. Mortensen) and at 

 Lohals on Langeland ^^Z? 1920 (the author). 



Geographical distribution: — Besides in Denmark the species 

 also occurs in Holland, according to specimens I have seen from 

 Pater Schmitz. 



68. A. setigera Lundbk. 

 1921. Lundbk. Vidensk. Meddel, fra Dansk naturh. Foren. 72, 136, 8. 



Male. Frons broader than high, greyish black, dull ; inner bristle 

 of lower row slightly below the outer or nearly in the same height and 



