16 
but fine and small. Wings a little brownish or greyish tinged, 
thev are a little narrow with somewhat parallel anterior and post- 
erior margins; veins dark brown; costa not reaching the middle, 
about 0,47 of the wing-length, costal divisions proportionately about 
as 4—2—1; costal cilia long, almost very long; fourth vein a 
little curved at the origin, for the rest very slightly curved. Hal- 
teres yellow. — Female. Quite similar to the male. Length fully 
1 mm. 
This species is distinguished from superciliata , besides by the 
longer costa, by the a little narrower wings and iarger hind tibial 
bristles. 
Holte 2S 6 1919 (Th. Mortensen); one male; Ry in Jutland 12 '7 
— 26 7 1918 (the author); three males and one female; one of the 
specimens was taken in grass with the net. 
18. A. tergata n. sp. $. 
Very like variabilis Wood but with much smaller bristles on 
hind tibiæ and at once known by the third abdominal tergite being 
abbreviated. 
Female. Frons greyish black, nearly 1 1 2 times as broad as 
long; bristles strong, the bristles of the lower row and the upper 
supraantennals placed on a straight or slightly convexe transverse 
line, and the inner bristles of the lower row about equally distant 
from the outer bristle and from the upper supraantennal; upper supra¬ 
antennals large, more approximated than the inner bristles of the 
middle row, the lower supraantennals somewhat smaller and more 
approximated than the upper. Antennæ not above ordinary size, 
blackish brown, arista somewhat long, distintly pubescent. Palpi 
yellow with long bristles. Thorax brownish black above, the lateral 
margins, humeri, scutellum and pleura more or less brownish or 
reddish brown; mesopleura bristly, the bristles equal. Scutellum 
with two bristles. Abdomen black or greyish black, venter a little 
paler; the third tergite abbreviated being shortest in the middle, 
longer towards the sides; the hairs on the sides are rather distinet 
on second segment. Legs yellow, hind femora very slightly dark- 
ened just at apex; bristles on hind tibiæ small and numerous. 
Wings strongly brown, veins strong, brown to blackish; costa well 
