Aphiochaeta. 



387 



bristles not large, iinequal, the lower aboiit half the size of the upper; 

 the upper supraantennals approximate, a little less distant than the 

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

 Antennæ small, black, arista distinctly pubescent. Palpi dusky 

 yellow or brownish, somewhat narrow, witli long bristles. Thorax 

 black, very slightly shining, with blackish brown piibescence. Meso- 

 pleura bare. Abdomen not slender, black, diill; the very short hairs 

 a little more visible at the hind margins of the segmenfcs, especially 

 at the hind margin of sixth segment. Hypopygium small, with quite 

 small hairs on the sides; below there is a somewhat large, yellow, 

 flap-like ventral plate; anal tube small, brownish. Legs yellowish 



Fig. 112. Wing of A. longicostalis (^ . 



brown or brown, the front legs a little paler; hind femora darkened 

 above and below, withoiit long hairs below; bristles on hind tibiæ 

 small, numerous and hair-like. Wings brown, veins dark brown; 

 the wings give the impression of being a little narrow; costa long, 

 a little varying, but generally about 0,55 or more; costal divisions 

 about as 8 — 7 — 3, thus 1 longer than 2, but shorter than 2 + 3; 

 costal cilia very long; fork somewhat long, the angle rather large, 

 varying, sometimes almost rectangular; fourth vein issuing behind 

 the base of the fork, distinctly, but not much curved in its first part, 

 for the rest slightly and evenly curved. H alteres yellow. 



Female. Similar; the lower supraantennals generally relatively 

 a little smaller; costa relatively longer, to 0,60 of the wing-length, 

 but also liere somewhat varying. 



Length. Fully 1 to 1,5 mm. 



I have determined this species as longicostalis Wood, and I think 

 the determination correct; Wood has only one striking character, 

 the long costa, which he gives to about ^U of the wing-length, but he 

 knew only the female, which as seen above has the longest costa; 

 for the rest my description will be seen to agree well with Wood. 



•25* 



