156 SYRPHIDE. 
genitalia dark yellowish brown, clothed with yellow hair; venter 
black, with rather long yellow hair on the hind borders of the 
segments. Legs eneous black, with rather long and dense, yellow 
and silky shining hair, chiefly on the tibic ; claws black, pulvilli 
dark yellow- brow n; tarsi not very broad, first joint of hind tarsi 
not thickened. Wings greyish hy aline, with a light yellowish 
tinge and yellow veins (the specimen is perhaps immature) ; lower 
outer corners of subapical and discal cells rounded and without 
appendices. 
Type &, a single specimen from Uganda Protectorate, plains 
N.E. of Lake Edward, 3,200 ft., “in the open,” 15-16. x. 1911 
(S. A. Neave). 
Genus 26. PTILOBACTRUM, nov. 
Closely resembling a Microdon belonging to Group V., and with 
shnilar venation, but distinguished by the breadth of the head, 
by the face being furrowed, and by the unusual shape of the 
antenne. 
Head of male much broader than the thorax ; eves bare, shining 
black, very small, oval, with small equal-sized facets, without con- 

= 
Fig. 25.—Piilobaelrum neavei, sp.n., Q. x4. 
vergent angies in the middle of the frons; frons enormously broad, 
without a trace of the usual median transverse groove, but with a 
distinct furrow rnnning from the upper corner of each eye to the 
ocdli; this furrow is ‘perhaps homologous with the usual median 
transverse groove; face enormously broad, broader than long, pro- 
minent read the middle, and provided with two broad furrow 
