34 
pleura bare. Scutellum with two bristles. Abdomen black or more 
brownish, especially the hinder segments; venter yellow; the third 
tergite is somewhat abbreviated as its hind margin is concave, at 
the sides it has full length but in the middle it has only two thirds 
of the length at the sides, the unchitinized part between it and 
the fourth segment is yellow. Legs yellow, hind femora brownish 
or blackened at the apex, the hairs below the basal half slightly 
longish; bristles on hind tibiæ small and numerous. Wings yel- 
lowish or brownish yellow, veins brown; costa long, beyond the 
middle, about 0,56 of the wing-length, costal divisions proportion- 
ately about as 5—3 — 2, thus 1 = 2 —|— 3, fork longish; costal 
cilia long; fourth vein a little s-like at the base, strongly curved 
in its origin, for the rest nearly straight. Halteres yellow. Length 
1 ,7—1,9 mm. 
Ermelund xl /& and 2 % 1919 (the author); two females. 
This species will in the female sex be recognized on the ab¬ 
breviated third abdominal tergite, but the male no doubt will be 
very similar to some other males in this group; the species may 
be similar to A. zonata Zett., but in that species k is the fourth 
tergite which remains unchitinized in its whole extent. 
12 - 9 - 19 . 
