THE EARLY STAGES OF CERTAIN WEST AFRICAN MOSQUITOS. 



151 



siphonal plumes, while three or four pubescent hairs and an independent hair 

 •detached towards the subsiphonal plume represent the anal plume. The comb 

 consists of 7-8 stout spines placed in an irregular row. The siphon is nearly nine 

 times as long as the diameter of its base and carries a pecten of 8-9 rather slender 





. \\ 



Fig. 7. Larva of Culex guiarti, Blanch. ; head and end of abdomen ; 



a, mental plate. 



spines, fringed at their bases. Four or five tufts formed of two to three simple hairs 

 are visible beyond the last spine of the pecten. The anal segment is nearly twice 

 as long as it is broad (30 : 16 units) ; the beard is somewhat scanty, but the dorsal 



