THE PUPAE OF WEST AFRICAN MOSQUITOS. 



87 



5th, and 6th segments there is at the posterior angle a tuft of 5 or 6 hairs ; just internal 

 to this a stout double seta, which is not so well developed as in C. thalassius ; and 

 again internal to this and on the posterior margin a tuft of 6 to 8 hairs. The latter 

 tuft is larger on the 4th and 5th segments than it is on the 6th, but on the 3rd segment 



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Fig. 10, Culex tritaeniorhynchus, G-iles. 



there is a similar tuft which is rather larger than that on the 4th segment. On the 

 2nd segment there is a small dendritic tuft. The dendritic tufts on the 1st segment 

 are well developed and have about a dozen primary branches. 



Culex guiarti, Blanch, (fig. 11). 



The pupa as a whole is very poorly chitinised. The paddles show no marginal 

 fringe ; they have paired small and slender terminal setae. Most of the abdominal 

 setae are poorly chitinised, the only conspicuous ones being the lateral tufts on the 

 7th and 8th segments, and the very long double setae on the 5th and 6th segments. 

 Near the posterior angle of the 8th segment there is a tuft of 7 or 8 subplumose hairs ; 

 this tuft is small, being less than a quarter the length of the midrib. In a similar 



Fig. 11. Culex guirti, Blanch. 



position on the 7th segment there is a tuft of 3 or 4 subplumose hairs, and on the more 

 anterior segments delicate tufts of about 5 fine hairs. On the posterior margin a 

 little internal to the angle there is on the 5th and 6th segments a strong double or 

 triple seta of great length ; in a similar position on the 4th segment there is a tuft of 

 5 hairs. A little internal to these setae there are delicate tufts on the 3rd to the 7th 

 segments. The dendritic setae on the 1st segment are large and much branched. 

 The trumpets are long, poorly chitinised, and have a narrow aperture. 



