80 A Monograph of Culicidae. 
upper branch a longer and on the lower branch a shorter dark spot. 
Further on the branches are light up to the marginal points. Accordingly, 
veins 3 and 4 are almost exactly marked like pharoénsis. The fifth 
vein is distinguished thereby that it possesses no dark spot at the point 
of division and that the upper branch is darker than light. It shows, 
namely, a small and a longer spot up to the middle and then a long dark 
streak that may amalgamate with the marginal spot. 
There are three spots on the sixth vein. On the ciliary margin the 
spots are broader than in A. pharoénsis, particularly remarkable on 
vein 6. The upper and middle central transverse veins often form a 
single straight line, and are at a distance of their common length from 
the lowest one, in other cases they are arranged step-like. 

Index of | Index of the 
Auxiliary Vein.| Fifth Vein. Length of Wings. 






Dar es Salaam : 42°5 | 37°5 3°4 mm. 
y + : ; 41°7 36:2 eis ees 
se AA : : 41-1 36°0 3 i. as 
South-West Africa . : 41°6 | 37°6 aS 5 
Average. ; 41°5 36°8 3°4 mm, 

The palpi have white joints and an entirely white terminal joint, 
which, however, may also have a dark ring in the middle. 
Vertex has greyish-trown scales. The eyes above are surrounded by 
white scales. 
Legs.—Femora and tibia exhibit light spots and stripes on a dark 
ground on their exterior and extensor sides; the tarsi and their joints 
have narrow light rings, the terminal joint of the first pair darkened, that 
of the last pair of legs lighter. The first tarsal joint, also, of the first pair 
is ringed with light at the end. 
The body of the specimen before me has been too much rubbed for me 
to give an opinion as to its markings. The skin of the thorax is grey in 
front, with a reddish tinge. The chitinous plates of the abdomen have a 
couple of white spots on their anterior half and a whitish stripe down the 
centre of the posterior half. The last but one segment of the abdomen 
is beset on the posterior margin of the venter with scales. 
The genital claspers of the 2 are compressed, and at their base there is 
a short process beset with strong bristles. . 
Thorax + abdomen.—4*3 mm. 
Head + proboscis.—2°8 mm. 
Length of the four palpal joints, 0*7—0°8—0°5—0°25 mm. 
¢. Club of the palpi on the upper surface white with a dark ring. 
The thickened end of the second joint is white on the upper surface, as is 
the long tuft of hair beneath the clubs and the first palpal joint. 
The upper fork cell is visibly shorter, the place of division being 
nearer the tip of the wing than the lower fork. 
