PUPAL STAGES OF WEST AFRICAN CULICID^. 23"' 



h. This difiEers from the above, in having the antennae with a black hair at 

 the tip, and in having six plumes on the face, besides the two outer under 

 plumes (PL VI, fig. 7). 



The thorax has the two characteristic hairs more markedly socketed, and 

 the two simple hairs have quite a spine at their base (PI. YI, fig. 8), 



The palmate hairs on the abdomen are very large, though that on the first 

 segment is smaller ; fourteen are present, a pair on each segment ; sixteen 

 curved scales can be counted on each hair, rising from a stout base ; the com- 

 plete hair fills a space, at its greatest width, equal to f of the length of a 

 segment (PI. VI, fig. 10). 



Described from a single specimen. 



c. Larvpe of d^- mm. 



The head is still very large in proportion, and I think that it is not the- 

 mature form. It is the same colour as (h). The antennae have two strong 

 hairs on the end, and a small dark plume between them. The face is similar 

 to that of (Z>), as are also the eyes. 



The thorax is even more hairy than in (h) j the simple hairs are present^ 

 but like the two posterior plumes they are socketed in a striking outgrowth 

 and have spines at their bases on the ventral side ; the dorsal side shows the 

 characteristic hair referred to in previous stages, and this also has a markedly 

 chitinous socket (PI. VI, fig. 1<S) ; the anterior plumes are short ; on either 

 side of the median line is a pair of short stifily haired plumes, rather striking 

 in character ; they are also present in Qj) in a much less developed condition,, 

 but not in (a) ; all these plumes are feathered. 



The palmate hairs are of the same type as in (h). The scales of the comb 

 are darker (PL VI, fig. 9> 



The papillse are much contracted at their base, pointed and hyaline in 

 colour ; ventral beard large, and of the same type as in the previous species. 



Described from three specimens. 



Pupa. 



The pupa is characterised by remarkably wide-mouthed trumpets ; the 

 plume is present on the seventh segment ; of the same type as Pyretopliorus 

 costalis, Lw.j but the spines on the other segments are stronger. When the 

 imago is a male the forcipes are contained in two hyaline sacs which come 

 down below the middle of the plates (PL VI, figs. 11, 12 & 13). 



Length of thorax under 2 mm. 



Described from five larv?e and one pupa. 



[Larvse and pupae found in a large water-hole behind the Medical Research 

 Institute and in road puddles in June and July. They resemble the larvae 

 of Pyretopliorus costaUs, but are somewhat longer and more slender. — - 

 W.M. G.] 



