Aphiochaeta. 311 



supraantennal bristles equal, the iipper as distant as the inner bristles 

 of middle row, the lower well below the upper and more approximate. 

 Antennæ small, blackish or blackish brown, arista long, distinctly 

 pubescent. Palpi yellow, somewhat large and with the bristles some- 

 what long. Thorax black, somewhat shining, with qiiite short and 

 dense, blackish or blackish brown pubescence. Mesopleura with uni- 

 form bristles. Abdomen black, somewhat strongly greyish, dull; it 

 has relatively dense, short hairs, almost not longer at the hind margins, 

 and also on sixth segment only very slightly longer. Hypopygium 

 quite small, grey, only with fine, short hairs on the sides; ventral 

 plate yellow, roimded; anal tube short, but stout, yellowish. Legs 

 yellowish or light brownish yellow, the hind legs darker, especially 

 the apical part of femora and the tibiæ; hind femora with long hairs 

 below the basal half; bristles on hind tibiæ relatively large. Wings 

 yellowish tinged, veins brown or pale brown ; costa not quite reaching 

 to the middle, about 0,46 — 0,47, 1 about equal to 2 + 3; costal cilia 

 long, but not specially long; fourth vein evenly curved in the whole 

 length, only slightly more at the origin. Halteres yellow. 



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

 basal half; first costal division in my specimens not relatively longer 

 than in the male as stated by Wood. 



Length 1,7—2,2 mm. 



I have compared my specimens with typical specimens from Wood. 



A. altijrons is rather rare in Denmark; Ermelund, Dyrehaven, 

 Lohals on Langeland and in Jutland in Egense Skov at the east end 

 of Limfjorden (the author); my dates are ^Vs — ^9 in 1917 to 1921. 



Geographical distribution: — Besides from Denmark only known 

 from England. 



66. A. chaetopyga Lundbk. 



192L Lundbk. Vidensk. Meddel, fra Dansk naturh. Foren. 72, 136, 7. 



Male. Frons slightly broader than liigh, black, a little greyish, 

 dull ; inner bristle of lower row in the same or nearly the same height 

 as the outer and about in the middle between it and the upper supra- 

 antennal; supraantennal bristles unequal, the lower considerably 

 smaller than the upper; the upper supraantennals as distant as the 

 inner bristles of middle row, the lower more approximate. Antennæ 

 somewhat small, black, arista distinctly pubescent. Palpi not large, 

 yellow, a little dusky, with ordinary, not long bristles. Thorax black. 



