NEW CULICINE LARVAE FROM THE GOLD COAST. 7 



The comb is formed of many scales, 60-70, arranged in a triangle. The siphonal and 

 anal plumes are composed of simple hairs, the subsiphonal of subplumose hairs. The 

 length of the siphon is three times the diameter of its base ; there are about 15 spines 

 in the pecten, some of which are detached outwardly, extending beyond the middle 

 of the siphon ; a single hair takes the place of the usual tuft. The anal segment is 

 almost as broad as it is long ; the hairs on the dorsum are collected into strong tufts, 

 and the ventral beard is well developed, extending over nearly the whole length of 

 the ventral surface, its tufts having a very unusual structure. The papillae are almost 

 twice the length of the anal segment. 



0. sudanensis may be distinguished from larvae having " Median tufts on head 

 each composed of three hairs " in Edwards' key (Bull. Ent. Res. iii, p. 376) by the fact 

 that its pecten has about 15 teeth. 



Pupa. — This has two small dark spots on the margin of each of the anal 

 plates. 



Breeding place. — The larvae were found along the sides of the stream at Sunyani 

 in small holes made by the youthful natives in their search for crabs. The water 

 contained in the holes is always opaque, holding much suspended matter. Larvae of 

 Anoplieles costalis, Ciilex insignis and Uranotaenia annulata were also obtained from 

 these crab holes. 



Culex pruina, Theo. (fig. 6).* 



The larva in life is light-coloured ; is possessed of a siphon swollen in the middle, 

 with its distal third much darker than the proximal two-thirds ; and bears some 

 resemblance to the larva of G. duttoni, being however of smaller size. 



The head is of moderate size and is not so wide as the thorax. The antennae are 

 covered with spicules, the hair-tufts, apparently consisting of branched hairs, are 

 inserted at three-fifths of the length of the antennae. The frontal hairs are all plumose. 

 The comb is formed of 35-40 scales arranged in a triangular patch. The hairs of the 

 siphonal and subsiphonal plumes are plumose, those of the anal plume are simple. 

 The siphon is four times the length of its basal diameter, tapering towards the tip ; 

 its distal third is more strongly chitinised than the proximal portion, and its pecten 

 of about 20 spines extends nearly to the middle of its length. On the ventral aspect 

 are at least six pairs of strong hair-tufts and numerous spicules are scattered 

 over this surface between those hair-tufts. The anal segment is about as 

 broad as it is long, and in addition to the usual hairs, has a plume of simple 

 hairs laterally. 



*Tlie adults whicli Dr. Ingram sent as having been reared from this remarkable larva 

 "were C. pruina, but the larvae are totally different from those attributed to that species 

 by Dr. W. M. Graham and described by Wesche under the name of G. pallidothoracis, Theo. 

 (Bull. Ent. Res. i, p. 36). Dr. Ingram also obtained specimens of this latter form (see fig. 7), 

 which he associated with adults of C. gmarti, Bl., though this larva is different from 

 that assigned to C. guiarti by Grraham. It remains for futm'o investigators to decide 

 which of these two is the true larva of C. pruina. — F. W. E. 



