Aphiochaeta. 341 



equal, the iipper less distant than the inner bristles of middle row, 

 the lower a little more approximate. Antennæ small, black, arista 

 somewhat long, distinctly pubescent. Palpi black or dark brown, 

 not small and with the bristles well developed. Thorax black, some- 

 what shining, with brown piibescence. Mesopleura bare. Abdomen 

 robust, black and dull, the hairs very inconspicuous, only visible at 

 the sides and at apex. Hypopygium qiiite small and withdrawn, 

 but it has small hairs below; anal tube very short, almost not pro- 

 truding, yellowish. Legs black, the front legs more brown with the 

 coxæ yellow; hind femora somewhat dilated, the hairs below short; 



Fig. 103. Wing of A. glabrifrons ,^ . 



hind tibial bristles distinct and not small, that is to say only the four 

 or five on the middle part, towards both ends they are small; the 

 dorsal hair-seam somewhat suddenly deflected anteriorly from the 

 middle. Wings very strongly brown and often with a cloud behind 

 the middle, veins brown and strong; costa reaching to the middle 

 or beyond, it is a little thickened in the first division, though this 

 thickening is not much pronounced, 1 slightly longer than 2 and 

 about equal to 2 + 3; costal cilia short; fourth vein issues anterior 

 'to the fork with a sort of peduncle, for the rest it is evenly curved, 

 the curve strongest on the middle. Halteres black. 



Female. Similar to the male; palpi sometimes paler to yellowish; 

 the costa not thickened and the basal stalk of fourth vein less or 

 sometimes almost not at all pronounced. 



Length 1,5 — 1,7 mm. 

 I Wood terms the hind tibial bristles weak and he even speaks 

 (1. c. 62) of practically bare hind tibiæ; in my specimens the bristles 

 on the middle part of hind tibiæ are fairly developed. 



A. glabrifrons is not common in Denmark; Ermelund, Geel 

 Skov, Lohals on Langeland and in Jutland at Ry (the author); 

 the dates are ^Vs — ^Vs in 1918 to 1921; at Lohals I took it in some 



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