Aphiochaeta. 345 



Male. Frons higher than broad, grey, not shining; bristles 

 strenger than in minor, inner bristle of lower row much below the 

 outer and rather near the eye-margin; supraantennal bristles not 

 large, unequal, the lower small, the upper somewhat distant, but not 

 or only a little more distant than the inner bristles of middle row, 

 the lower supraantennals a little more approximate. Antennæ small, 

 brown, arista short-pubescent. Palpi yellow, of ordinary size, with 

 somewhat short bristles, Proboscis somewhat well developed. Thorax 

 black, only slightly shining, with darker or paler brownish pubescence. 

 Mesopleura bare. Abdomen black, somewhat greyish, dull, the short 

 hairs very slightly longer at the hind margins of the segments and 

 almost not longer on sixth segment. Hypopygium small, greyish, the 

 lower hinder corner drawn a little out and with a small hair, and 

 forwards and upwards there are smaller hairs; below there is a medium- 

 sized, rounded, dark or dusky ventral plate; anal tube of some size, 

 yellow. Legs yellowish or yellowish brown, the front legs the palest, 

 the hind legs the darkest; hind femora rather dilated, with the hairs 

 below the basal half long; bristles on hind tibiæ strong and the postero- 

 dorsal bristles on middle tibiæ also somewhat developed. Wings 

 yellowish or yellowish brown, veins brown or pale brown; costa 

 reaching to or generally beyond the middle, 1 about equal to 2 + 3, 

 but it may be shorter or longer; costal cilia short, somewhat dense 

 and distinctly stronger than in minor\ fork generally rather longish 

 and the angle somewhat large, but both length and angle varying 

 and in accordance herewith also the relative lengths of division 2 

 and 3; fourth vein well curved in its basal part, for the rest slightly 

 curved or nearly straight. H alteres yellow. 



Female. Similar; hind femora likewise with long hairs below; 

 abdomen often shining above. 



Length 1,3 — 2,4 mm, the smallest sizes rarely met with. 



As already mentioned by Schmitz 1. c. the frons in this species 

 may vary in breadth, especially in the female; it is sometimes nearly 

 quadratic. In the position of the inner bristles of lower row I find no 

 principal dilTerence from minor. According to Schmitz, the balteres 

 sometimes may be dark. 



A. angustijrons is not rare in Denmark; Utterslev Mose, Dam- 

 hussø (Larsen), Ermelund, Geel Skov, Bogø south of Sealand, Lohals 

 on Langeland and in Jutland at Hejls south of Kolding and Jelling 

 (the author); my dates are Ve — ^Vg in 1907 to 1921; I have taken 

 it in copula on ^"/s; a pupa was taken in May in Utterslev Mose in 

 flood refuse and it developed soon after (Larsen). 



