50 LARVAL AND PUPAL STAGES OP WEST AFRICAN CULICID^E. 



[Larva and pupa found in the water o£ a crab-hole at the edge o£ the 

 Ebuli-putta lagoon, early in September. The crab-hole communicated below 

 ground with the lagoon, but no larva was found in the adjacent water of the 

 lagoon, their existence being perhaps prevented by the presence of small fish. 

 These fish were absent from the crab-hole. — W. M. G.] 



29. Uranotaenia balfouri, Theo. 



Larva. 



These are small, very dark and rather elongate larvse, with dark heads of 

 peculiar shape. 



The antennae are small and without plumes : brush moderate ; the face 

 has four characteristic thick hairs and a plume on each side. 



The thorax has the usual hairs on the anterior edge, and pronounced plumes 

 on the sides ; it can just be seen that the hairs are plumose. On the ventral 

 side are two peculiar "star hairs'^ on each of the posterior angles (Pl.II, fig. 4). 



From the second segment there are short plumes of stellate simple hairs, 

 two on each side of the segment, one above the other, which give a fairly 

 hairy appearance to the abdomen. The usual plumes on the eighth segment 

 are present. Seen with a magnification of 60 diameters the comb appears as 

 a row of 6-8 dark squares ; seen with about double that magnification, it 

 appears as a single row of six spines with double or split bases (PI. I, 

 fig. 19)._ 



The .siphon is short, being less than one half the length of the abdomen ; 

 it measures 3^ times its own base, and does not taper to the valves, which 

 are large ; the spines are small, numerous and regularly disposed, they run 

 for I of the length from the base ; in the middle of the ventral side are 

 large lateral plumes; its structure is a verj^ characteristic one (PL II, fig. 1). 



The anal segment is long, with shorter papillae ; there are many long hairs 

 on the dorsal edge, and a few on the ventral ; no beard, but some long hairs 

 on the edge and a plume on the ventral side. 



All the hairs on this larva are either simple, or much less plumose than in 

 the others. 



Length of larva less than 3 mm. 



Pupa. 



This is also small, and has some hairs near the trumpets, which are only 

 occasionally present. The sliajje of the anal plates is peculiar, being more 

 knife-like than usual (PL II, figs. 2 & 3). 



Thorax of pupa 1 mm. long. 



Described from four larvae and three pupae. 



[LarvaB found in borrow-pits along the side oC the railway from June to the. 

 middle of July. In the resting position the larvae lie almost horizontally. — 

 W. M. G.] 



