PUPAL STAGES OF WEST AFRICAN CULICID.E. 25 



4. Stegomyia fasciata, F. 



Larva. 



Small, with a large head, which is lighter in colour in the earlier, than in 

 the more mature stages. Antennse light, very simple, without any plume, 

 and the few minute hairs that are piosent at the tip are only a shade longer 

 than the width of the antenna. Face without long plumes, with only single 

 or double hairs (all apparently varying in the different stages of growth) or 

 short quintuple or quadruple hairs, but these seem to be constantly simple. 

 Hairs on the labrum noticeably thick and bushy, as are also the brushes. The 

 eyes are very small and round, but these organs are usually variable ; this 

 character is constant in all the larvae (two stages) collected by Dr. Graham. 



The thorax is small, broader than the head in only one specimen ; the 

 anterior dorsal plumes are absent, or represented by small stellate hairs ; the 

 part is well haired, the plumes on the ventral side, in the middle and posterior 

 portion, have a large chitinous bristle or hook at their bases. All the plumes 

 and hairs are with difficulty seen to be subplumose, and that only at the 

 bases. 



The abdomen has long double hairs (subplumose at their bases, like those 

 on the thorax) on the first five segments, besides numerous stellate and short 

 hairs, all being simple. The comb, though consisting of very large dark 

 scales, is only easily seen on light larvse ; it consists of a single row of 8-9 

 barbed scales ; those nearer the anal segment appear smaller and are difficult 

 to see. The siphonal, sub-siphonal and anal plumes are all small and of simple 

 hairs. 



The siphon is rather more than a quarter of the abdomen in length (un- 

 reliable character) and is about 2 J times as long as its own base ; the spines 

 which are long, and much barbed at their bases, run for half the length, 

 nearly parallel with the sides of the siphon ; their number and shape are not 

 reliable characters, as the first is variable, and the second has its counterpart 

 in many species. The spines are followed by a triple hair^ and the valves are 

 small. 



The anal segment is very short, only a little longer than the breadth of the 

 siphon ; the papillae are equal, stout, and with strikingly blunt ends ; they 

 are twice as long as the segment ; the dorsal edge carries 4 (?) long simple 

 hairs and there are some of similar length on the ventral edge — the ventral 

 beard is on the end but is very liable to denudation. 



Lenoth about 4-5 mm. 



o 



Pupa. 



The pupa has short trumpets, and large tree-like plumes of branched hairs 

 at the base of the thorax (only one can be seen in one focus at the lateral 

 view) . 



