22 
anal tube short but high, yellow. Legs dark yellow or brownish 
yellow; they are rather short and robust, the femora somewhat 
thick; front tibiæ not much more than half as long as femora, 
also middle tibiæ short and a little arched, hind tibiæ likewise 
short and distinctly arched ; all tibiæ somewhat thick; bristles on 
hind tibiæ distinet and not short but fine. Wings brownish, veins 
brown and somewhat strong; costa 0,4i of the wing-length, costal 
divisions proportionately about as 10 — 5—3; angle at fork some¬ 
what acute; costal cilia long; fourth vein sligthly and evenly curved. 
Halteres yellow. Length 1,7 mm. 
Ry in Jutland 19 A 1918 (the author); one male. 
% 
Mesopleura bare. 
Costa long, fringe short. 
25. A. griseifvons n. sp. J. 
A species near surdifrons Wood but larger, with the supra- 
antennal bristles very unequal and otherwise distinet. 
Male. Frons considerably broader than long, grey; inner bristle 
of lower row below the outer, rather close to it and rather near 
the margin; supraantennals unequal, the lower less than half as 
large as the upper; the upper supraantennals fully as distant as 
the inner bristles of the middle row, the lower supraantennals a 
little more approximated. Antennæ not small, brownish black, 
arista somewhat short, distinctly pubescent. Palpi yellow, not large 
and with the bristles somewhat short. Thorax black; mesopleura 
bare. Scutellum with two bristles. Abdomen deep black. Hypo- 
pygium quite small and retracted, though a subanal body is ex- 
posed in the shape of a downwards protruding process; ventral 
plate broad but short, yellow; anal tube somewhat small but of 
medium length, yellow. Legs yellow, hind femora slightly brown¬ 
ish yellow, the hairs below the basal half longish; bristles on hind 
tibiæ distinet but somewhat small; front tarsi with the three first 
joints somewhat stout. Wings a little yellowish, veins brown; 
costa reaching nearly or quite to the middle, costal divisions pro¬ 
portionately about as 10—6 — 3, costal cilia short or moderately 
