IMPERIAL BUREAU OF ENTOMOLOGY. 



BULLETIN 



OF 



ENTOMOLOGICAL RESEARCH. 



Vol. VII. 1916. 



NEW CULICINE LARVAE FROM THE GOLD COAST. 



By J. W. Scott Macfie, M.A., and A. Ingram, 



West African Medical Staff. 



Since Mr. F. W. Edwards' " Revised Keys to the known larvae of African 

 Ciilicinae" appeared (Bull. Ent. Res. iii, pp. 373-385) the larvae of several additional 

 species — all belonging to the tribe Culicini- — have been found in the Gold Coast 

 Colony. These larvae, collected at Accra and at Sunyani in Ashanti, are briefly 

 described here and their position in Mr. Edwards' keys indicated so far as possible^ 



Stegomyia metallica, Edw. (fig. 1). 



The larva is dark in colour with prominent hook-like spines on the ventro-lateial 

 aspect of the thorax ; these spines are much larger than the corresponding spines in 

 S.fasciata. The head is small, the antennae are short, with a single hair in place of a 

 tuft and the mid-frontal hairs are simple single bristles. There are numerous stellate 

 hairs on the thorax and the abdominal segments, a certain number of the stouter 

 hairs on the abdomen are branched and rise from pedicles ; these stouter hairs are 

 subplumose at their bases. The comb consists of 6-10 barbed spines,* the subsi- 

 phonal and siphonal plumes are of subplumose hairs. The siphon, which is barrel- 

 shaped, is in length just over twice the diameter of its base ; the pecten, rimning 

 somewhat diagonally, is formed of from 12-14 spines and a hair- tuft of four hairs is 

 placed at or just beyond the middle ; a detached spine may occur beyond this hair- 

 tuft. The anal papillae have rounded ends, the upper pair being about twice the 

 length of the anal segment, the lower about two-thirds as long as the upper. 

 The anal segment has a slight ventral beard and a plume of simple hairs laterally, 

 on the posterior edge of the chitinous saddle. 



*Tho number is variable even on the two sides of the same larva ; oue specimen had 

 three on one side and seven on the other. — F. W. E. 



(C250) Wt.P8/91. 1,000. 5.16. B.&F. Gp. 11/1. 



