25 
the upper; the upper supraantennals equally distant with the inner 
bristles of the middle row, the lower distinctly more approximated. 
Antennæ black, perhaps a little above ordinary size, arista pube- 
scent. Palpi dusky yellow, of ordinary size and armature. Thorax 
black; mesopleura bare. Scutellum with two bristles. Abdomen 
black, somewhat robust. Hypopygium small and withdrawn; ventral 
plate yellow, short but broad; anal tube minute, blackish. Legs 
blackish or blackish brown, front legs paler; the legs upon the 
whole somewhat robust, hind tibiæ distinctly thickened and above 
near the knees suddenly contracted; the bristles small and fine. 
Wings white, thick veins brown, the others more pale; costa about 
0,43 of the wing-length, costal divisions proportionately about as 
15—5 — 4; costal cilia moderately long; fourth vein a little curved 
at the origin for the rest nearly straight. Balteres brown. — Fe¬ 
male. Similar to the male but the legs less or not robust and hind 
tibiæ of common shape; palpi yellow. Length 1 —1,3 mm. 
Ry in Jutland 9 A and 15 A 1918 (the author); one male and 
one female. The sexes were taken on the same locality (though 
not at the same time) and as they are rather agreeing I think it 
beyond doubt that they are specifically identical. 
29. A. Mortenseni n. sp. $ . 
A species near rnaura Wood but with a bristly hypopygium. 
Male. Frons considerably broader than long, black, very slightly 
greyish and with an indication of being shining; inner bristle of 
lower row somewhat below the outer and about equally distant 
from it and from the upper supraantennal; supraantennals not large, 
nearly equal, the lower only slightly smaller; the upper pair about 
equally distant with the inner bristles of the middle row, the lower 
close below the upper and more approximated. Antennæ rather 
large, black, arista short pubescent. Palpi black or blackish, of 
ordinary size and armature. Thorax black, a little shining; meso¬ 
pleura bare. Scutellum with two bristles. Abdomen somewhat 
robust, a little greyish, the hind margins to the segments indistinctly 
pale. Hypopygium of medium size, shining above in the middle 
at the base; on each side there is a nearly vertical series of about 
six strong bristles, increasing in size downwards, besides the post- 
