138 SYRPILIDE. 
yellowish, with silky reflexions; hair on the third antennal joint 
of a dark grey colour; rudiment of the arista reddish; proboscis 
pale : yellow; head below clothed with long whitish hair. Thorax 
and scutellum entirely black, punctate, with rather long but slant- 
ing pale yellow pubescence ; front part of the pleuree with rather 
long, erect, whitish hair, hind part bare ; scutellum semicircular, 
with a faintly marked median longitudinal furrow. Metanotum 
shining black. Squamule white, with short white fringes ; halteres 
pale yellowish. First se sement ot the abdomen blacks with a 
narrow yellow hind border on each side; second entirely yellow ; 
third yellow, with a broad rounded black spot on each side, w hich 
reaches the fore border but not the sides; fourth black, with 
lateral borders narrowly yellow, and also bearing a triangular dark 

Fig. 27.— Ptilobactrum neavei, sp. n., ¢. 
Head in profile, x 7. 
yellow median spot at the distal extremity ; abdominal pubescence 
very short, whitish, but black along the ‘middle line ; belly black, 
yellowish pubescent ; genitalia black. Legs bare, the femora 
shining, the tibize whitish-dusted; coxa and hind trochanters 
black; femora and tibie yellow, the latter w ith a blackish spot 
above at tip; tarsi broad and flat (especially the front pair), black, 
with yellowish pubescence ; first joint of hind tarsi not thickened ; 
claws black, pale at the base; pulvilli yellow. Wings hyaline, 
shining, with a faint pale yellowish tinge ; veins yellow, more or 
less darkened outwards ; vena spuria very faintly marked. 
Type d,a single specimen from British East Africa, Upper 
Nzoia River, 5,100 5,400 ft., 5-7. vi. 1911, collected by S. A. Neave, 
in whose honour this strange and beautiful insect is named. 
Genus 27. CERIOIDES, Rondani (1850). 
Of this genus there are in the collection only six specimens, 
which, however, belong to five different species or varieties. The 
Ethiopian species of Cerioides at present known, some of which 
were very recently described in a valuable paper of Prof. Hervé- 
Bazin, number thirteen. 
