PUPAL STAGES OF WEST AFRICAN CULICID.E. 21 



■c. 4^ mm. larvae. 



Head small, but not so small as the head in (h). The eye with a darker 

 pigment in front (dorsal view) ; all the plumes on the face are of single 

 feathered hairs. The hairs at the end of the antennae are branched, but 

 are difficult to see ; the collar is broader than in (a), but narrower than 

 in (J). 



The thorax is well differentiated ; the anterior dorsal plumes are short, but 

 the ventral plumes are much larger^ there being four large ones on the third 

 segment. There are two simple hairs anteriorly on the under side of the first 

 segment with a short curved bristle at the base ; all the other hairs are 

 feathered (PI. VI, fig. 3). 



The abdomen has on the first three segments two lateral long feathered 

 hairs, one above the other. There are small palmate hairs on the dorsum of 

 the first segment, and on segments 2-7 palmate hairs of the same large 

 size as in (a). The comb is much of the same type. 



The siphon is rather less differentiated than in (a), but this cannot be 

 stated with certainty. 



Anal segment and papillae much as before, but the ventral beard is 

 exceedingly large. 



Described from three larvae. 



d. 6 nnn. larvae. 



The head is very small, 5 units of breadth as compared with 11 of the 

 thorax. The antennae have now a serrated inner edge ; the collar is very 

 broad seen doi-sally, and the brush very prominent. The eyes are again large 

 with a pigment spot behind. 



Thorax very large ; the surface is wrinkled on the dorsum, and on the 

 ventral side bears a regular pattern (PI. VI, fig. 1). All the plumes and 

 hairs are shorter than in the previous stage ; the simple hairs noticed then are 

 iigain present, and appear to mark the limit of the anterior segment. 



The abdomen has plumes of feathered hairs on the first three segments, 

 but only simple double hairs on the others. The palmate hairs appear very 

 liable to denudation, as one only is present on the seventh segment, in one 

 specimen ; on the other, one can be seen on the third segment and a pair of 

 modifications (PI. V, fig. 21) on the first segment. The bars and spots 

 figured by Nuttall and Shipley on the dorsal segments can be made out in 

 this species (PL V, fig. 23). 



Both the larvae have vorticellae and diatoms, besides algal growth, on 

 them. 



The character of the comb remains the same, four short spines followed by 

 a long one ; the anal armature as regards the plumes is less, but the papillae 

 appear constant. 



