140 
to the upper supraantennal; supraantennals unequal, the lower about 
half the size of the upper; the upper supraantennals approximated, 
nearer together than the inner bristles of the middle row, the 
lower a little more approximated. Antennæ a little large, black, 
arista short-pubescent. Palpi brownish black. Thorax black, slightly 
shining. Mesopleura bare. Abdomen black, duli, slightly greyish. 
Hypopygium of medium size, greyish, on the sides at the lower 
margin are numerous hairs among which a couple longer and a 
little bristly and above on the hind part are some shorter hairs; 
anal tube short but high, blackish grey. Legs black, front legs 
only slightly paler; hind femora with long hairs below the basal 
half; bristles on hind tibiæ distinet and not numerous but some- 
what short. Wings somewhat strongly brownish tinged and thin 
veins somewhat strong; costa nearly to the middle, costal divisions 
about as 14—7 — 4; angle at fork somewhat acute, costal cilia 
moderately long; fourth vein evenly curved. Halteres black. — 
Length 2 to fully 2 mmm. 
Geel Skov 19 U and 22 U 1919 (Th. Mortensen, the author), two 
males, one was taken on a fresh stub of Acer. 
The species locates itself together with frontalis in one group 
and therefore the female will, I think, not be difficult to identify. 
Bristles on hind tibiæ small and hair-like. 
13. A. similata n. sp. . 
Frons broader than high, black, a little greyish, duli; inner 
bristle of lower row slightly below the outer and nearer to it than 
to the upper supraantennal; the supraantennals unequal, the lower 
about half the size of the upper or somewhat more; upper supra¬ 
antennals approximated, nearer together than the inner bristles of 
the middle row, the lower only slightly more approximated. An¬ 
tennæ somewhat small, brownish, arista long, distinetly pubescent. 
Palpi yellow, the bristles rather long. Thorax black, very slightly 
shining; pleura more or less brownish, anteriorly stretching up on 
the humeri. Mesopleura bare. Abdomen black, duil. Hypopygium 
large, as long and broad as sixth segment, cylindrical; on the sides 
and at the hind margin it is clothed with longish hairs, longest 
below, but there are no bristles; anal tube of medium size, yellow, 
