NEW CULICINE LARVAE FROM THE GOLD COAST. 5 



this hair is well beyond the middle of the siphon. The papillae are longer than the 

 anal segment and have rounded ends ; the dorsal pair not much longer than the 

 ventral. As in S. metaUica, there is a hair-tuft at the lateral edge of the chitinous 

 plate of the anal segment. 



S. luteocejihala comes close to S.fasciata in Edwards' key (Bull. Ent. Ees. iii, p. 376) : 

 ' Siphon more than twice as long as broad ; . . . comb scales &-9 " ; but the hair- 

 tuft is replaced by a single stout hair, and the comb scales are simple. 



Pupa.' — None was examined. 



Breeding place. — The larvae were found in the sagging gutters of two bungalows 

 at Accra. The water in which they were living was slightly turbid and contained a 

 layer of decaying vegetable matter. 



Ochlerotatus irritans, Theo. (fig. 4). 



The larvae are light in colour. The head is of moderate size, with rather stout 

 antennae, which carry a tuft of simple hairs towards their outer sides ; no constriction 

 is seen at the insertion of this hair-tuft in the middle of the antennae. The median 

 frontal hairs are multiple and are slightly pubescent at their bases. The anterior 

 thoracic hairs are poorly developed. The comb is formed of about 50 scales arranged 

 in a triangular patch. The subsiphonal plume consists of hairs which are scantily 

 plumose, while the hairs of the siphonal and anal plumes appear to be simple. The 



Fig. 4. Ochlerotatus irritans, Tlieo. 



length of the siphon is three and a half times the diameter of its base ; the pecten, 

 extending to half the length of the siphon, comprises 15-18 spines, and beyond the 

 spines occurs a tuft of three or four hairs. The anal segment is feebly chitinised, 

 while the anal papillae are so short as to appear like projecting knobs. 



0. irritans comes near to 0. tnarshalli in Edwards' key (Bull. Ent. Res. iii, p. 376) 

 " Median tufts on head each composed of 6-8 hairs, pecten with 12-18 teeth. . . . 

 Hair tuft normal, branched, situated in middle of siphon." Judging from Wesche's 



