4 J. W. SCOTT MACFIE AND A. INGRAM. 



The females under these conditions fed on blood reluctantly and did not deposit their 

 eggs either frequently or regularly. In one experiment, for example, a newly hatched 

 female isolated in this way took her first meal of blood on the evening of the eighth 

 day, but did not lay any eggs until the twenty-second day. In this respect S. metallica 

 differs notably from S. fasciata. When kept together in considerable numbers the 

 mosquitos bred freely, and so far as laboratory experience goes, it seemed immaterial 

 to the larvae whether they were reared in a highly nitrogenous, dark brown medium, 

 such as that in which the original larvae were found, or in a comparatively clear one 

 of tap water with a layer of sand at the bottom. The larvae were observed to remain 

 submerged for long periods and were frequently seen to bury themselves completely 

 in the flocculent deposit which collected at the foot of some of the jars. In this they 

 appeared to obtain assistance from the ventral thoracic spines, both in maintaining 

 their position and in penetrating the deposit. The life-cycle of S. metallica in one 

 experiment was as follows :— Egg, 7 days ; larval stage, 10 days ; and pupal stage, 

 3 days. 



Stegomyia luteocephala, Newst. (fig. 3). 



The larva is dark in colour and closely resembles that of S. fasciata, the thorax 

 exhibiting hook-like spines of a similar size. The head is dark, the antennae are short, 

 having a single hair in place of a hair-tuft, and the midfrontal hairs are represented 



Fig. 3. Stegomyia luteocephala, Newst. 



by single bristles. The thorax and abdomen bear stellate hairs which are simple in 

 character and not so numerous as those upon S. metallica. The comb is formed of 

 7-10 simple spines, which are longer and narrower than those of S. metallica. The 

 siphonal and subsiphonal plumes are composed of simple hairs. The length of the 

 siphon is more than twice the diameter of its base (43 units to 18) ; the spines of the 

 pecten are 12-15 in number and are placed slightly diagonally, as in S. metallica. 

 In the place of the usual hair-tuft a single long stout hair is found ; the position of 



