a new Genus and eight new Species of Diptera. 511 
‘distinct bristles on the upper margin. Only two frontal bristles 
on each side of upper third of frons, the hinder one pointing back- 
wards, the front one forwards, on rest of frons only a single row of 
very short incurved hairs each side and very short scattered hairs 
on disc. Face exceedingly short, the mouth-opening curving 
upwards almost to the tip of frontal lunule, leaving narrow cheeks 
each side which join the very narrow jowls below the eyes. A 
short black vibrissal bristle followed by 2-3 others, becoming shorter 
and finer as they approach and merge into the black hairs on lower 
part of back of head. Eyes microscopically pubescent. Antennae 
short, third joint dark brown, slightly yellowish in some lights, 
with a long, very distinctly pubescent, arista. Palpi very large, 
dilated in the shape of an equilateral triangle with rounded corners 
and slightly rounded sides ; they are dark yellowish-brown and clothed 
with very short, fine, dark pubescence. Proboscis hidden between 
‘the palpi. Thorax rather greyish on humeri and right in front ; 
front part of meso- and sterno-pleurae olive brown with a tendency 
to appear greyish in some lights. Disc covered with very short 
black hairs which leave three exceedingly narrow lines down the 
thorax, bare. Two pairs of dorso-central bristles, the front pair 
much the weaker, placed close to the hind pair and a little nearer 
the mid line of thorax; a strong central prescutellar pair of bristles, 
a humeral, a posthumeral, two notopleural, and three supra-alar 
bristles placed in a straight line parallel with a line joining the 
two strong bristles on postalar callus; four scutellar bristles with 
the middle pair cruciate; a tiny prothoracic bristle immediately 
above the base of front coxa and the usual three sternopleural 
bristles; mesopleura bare. Abdomen only a little broader than 
thorax, the long 2nd segment and the 3rd—5th segments entirely 
silvery-grey dorsally as in speciosa. Legs the colour of thorax 
but posterior knees very narrowly yellowish. Wings hyaline 
except at base as far as humeral and basal cross-veins; end of sub- 
costal vein distinctly, and small (discal) cross-vein slightly, darkened ; 
this latter cross-vein placed at 4, or very slightly more, from base of 
discal cell; cross-vein closing discal cell sloping so that lower outer 
angle of cell is acute. Last portion of discal vein slightly shorter 
than penultimate portion and almost parallel with cubital vein. 
Squamae and halteres dark. 
Q. Resembling the male except that the abdomen is entirely 
dull, dark brown and bears more numerous short black hairs. Frons 
slightly wider at vertex and more parallel-sided. 
Length 4mm. One pair. 
[The specimens arrived in a pill-box bearing the date 
