144 



A. INGRAM AND J. W. S. MACFIE. 



Ochlerotatus apicoannulatus, Edw. (fig. 4.) 



The whole larva is of a dark brown colour and very opaque, so that it is difficult 

 n an uncleared specimen to distinguish details. 



The head is a little more than half the width of the thorax, being well chitinised. 

 The antenna is of a light brown colour, curved, and covered with spicules. The 

 whole antenna measures about 25 units and carries a tuft of five or six subplumose 

 hairs at 11 units from its base. The mid- frontal hairs are multiple (8-10) and are 

 plumose ; the ante-antennal tuft is plumose. There are on the lateral aspect of the 

 head three tufts of hairs, a small one immediately in front of the eye and a large one 

 slightly posterior to the eye ; the hairs constituting the tufts are simple ; a short 

 distance anterior to the small tuft of simple hairs is a well developed tuft of plumose 



Fig. 4. Lirva of Ochlerotatus apicoannulalus, Edw.; head and abdomen; 



a> mental plate. 



hairs situated more towards the ventral aspect of the head. The mental plate shows 

 a stout median tooth with nine teeth on each side ; these lateral teeth, which are 

 pointed, increase in size towards the base of the plate. 



The thoracic plumes are small. The lateral abdominal hairs are multiple on the 

 first segment and paired on the other segments. The subsiphonal plume is formed 

 of plumose hairs ; the anal one apparently consists of simple hairs, and the siphonal 

 seems to be represented by a single hair, but this is difficult to determine. The comb 

 consists of 11-12 spines set in an irregular row. The siphon is about three times as 

 long as the diameter of its base (55 units X 19) and carries a pecten of 18-20 barbed 

 teeth, the last tooth being situated at about 23 units from the base of the siphon, 



