30 
nals unequal, the lower somewhat more than half as large as the 
upper; the upper supraantennals more approximated than the inner 
bristles of the middle row, the lower pair direct below the upper. 
Antennæ somewhat small, black, arista slightly pubescent. Palpi 
yellow, of ordinary size and armature. Thorax black with a slight 
greyish hue; mesopleura bare. Scutellum with two bristles. Ab- 
domen somewhat tapering behind, grey, in some lights bluish grey, 
with very narrow pale hind margins to the segments, broadest on 
the sixth segment. Hypopygium somewhat large and nearly cylin- 
drical, greyish; on the sides it has numerous short hairs; ventral 
plate small, whitish yellow, triangularly pointed; anal tube short 
but somewhat high, yellow. Legs yellow, hind femora dark at apex, 
with longish hairs below the basal half; bristles on hind tibiæ of 
medium size. Wings clear or nearly so, veins yellow; costa 0,39 
of the wing-length, costal divisions proportionately about as 12— 
5—4; costal cilia long; fourth vein a little curved at the origin 
and evenly curved towards the end. Halteres yellow. Length 
about 2 mm. 
Holte 2i /i and 12 /s 1918 (Th. Mortensen); two males. 
The following 5 species belong to the group costalis-nndiuentris 
by Wood, the group having a long and long ciliated costa, bare meso¬ 
pleura and (so called) bare hind tibiæ. 
35. A. analis n. sp. cT • 
Male. Frons considerably broader than long, black, slightly 
greyish; bristles strong, inner bristle of lower row below the outer 
and nearer to it than to the upper supraantennal; supraantennals 
nearly equal, the upper a little more approximated than the inner 
bristles of the middle row, the lower still slightly more approx¬ 
imated. Antennæ not small, brown, arista distinctly pubescent. 
Palpi yellow, of ordinary size and armature. Thorax black with an 
indication of reddish anteriorly and especially on the pleura; meso¬ 
pleura bare. Scutellum with two bristles. Abdomen somewhat 
robust, black with narrow paler hind margins to the segments. 
Hypopygium of medium size, reddish or brownish with a greyish 
tint, without bristles but with small hairs on the hind part; ventral 
