31 
plate small, yellowish; anal tube quite short but stout, yellowish. 
Legs brown, front legs not distinctly paler; a few longish hairs 
below the basal half of hind femora; bristles on hind tibiæ small 
and fine. Wings yellowish or light brownish tinged, thick veins 
yellow, thin veins darker, more brown; costa not reaching the 
middle, 0,45 of the wing-length; costal divisions proportionately 
about as 11—6—4; fork longish and the angle somewhat acute; 
costal cilia long; fourth vein evenly curved. Halteres black or 
blackish brown. Length about 1,5 mm. 
Holte l6 /8 1917, Hillerød 2l /e 1919 (Th. Mortensen); three 
males. 
This species is easily distinguished from the others in this 
group as none of them show so short a costa nor, I think, so 
acute a fork. 
36. A. setifer n. sp. £. 
Male. Frons considerably broader than long, greyish black; 
bristles strong, inner bristle of lower row a little below the outer 
and about equally distant from it and from the upper supraantennal; 
supraantennals unequal, the lower pair quite small; the upper 
supraantennals as distant as the inner bristles of the middle row, 
the lower slightly more approximated. Antennæ somewhat large, 
black, arista distinctly pubescent. Palpi well developed, a little 
above ordinary size, brownish, they have a long bristle at the end, 
the other seem to be weaker. Thorax black; mesopleura bare. 
Scutellum with two bristles. Abdomen black, long, siender and 
tapering. Hypopygium dark brown, somewhat greyish; it is large, 
longer than the sixth segment, somewhat cylindical; it has nume- 
rous short hairs on the hinder part downwards on the sides but 
no bristles; ventral plate large, brownish, rounded at the end; 
anal tube short, brownish. Legs yellowish brown, hind femora 
slightly darker above and towards apex; front tibiæ with a postero- 
dorsal row of rather long but fine, erect bristles; hind femora with 
longish, not sparse hairs below the basal half; bristles on hind 
tibiæ small and numerous. Wings somewhat brownish tinged, veins 
strong, dark brown; costa well beyond middle, costal divisions pro¬ 
portionately about as 11 —10—5, thus 1 and 2 nearly equal and 
each double 3; fork longish, angle somewhat large; costal cilia 
