GENERIC CHARACTERS OF LARV^ OF CULICID.13 61 



on the sides of the other segments. In all the Indian 

 species the larvae are of a dirty brown colour ; with a few 

 rather ill-defined patches of pigment on the head and 

 thorax. In Anopheles Bossil mihi there are two patches of 

 pigment on the dorsum of the head, which, combined with 

 the eyes, give this region of the larva, when regarded from 

 above, a quaint resemblance to a human skull. The head 

 is less rounded than in Cidex, and the constriction between 

 it and the head is deeper but less obvious than in that genus, 

 as it forms rather a truncated cone, with the broader part 

 behind, than a sphere. The tergum of the third metamere 

 is in the form of a lozenge, with the anterior corner cut 

 off and the point behind, and is ornamented in front with 

 six plumed bristles, the outer of which are the largest. 

 That of the second metamere is broad and short, and 

 carries at each of its outer corners a single plumose bristle. 

 As in Culex, it is provided at its outer part with a dense 

 whorl-organ. The labrum, which is tongue-shaped and 

 crenated on either side, is small and hirsute. It is, 

 moreover, overhung by the clypeus, so that it is little in 

 evidence when viewed from above. The ej^es form a 

 band of pigment of somewhat pyriform outline, with the 

 narrower end backwards, and on their outer sides are the 

 small ocelli. 



The antennae generally resemble those of Culex, but are 

 armed with a row of short, stout. spines along the inner 

 border of the basal joint. They carry also certain fan- 

 shaped and other specialised bristles. The mouth parts 

 closely resemble those of Culex, but the whorl-organs are 

 larger. The lower lip forms an equilateral triangle, with a 

 few strong dentations on its sides, and is prolonged into 

 a peculiar dentated process, besides which, as seen from 

 below, it is partly covered by two plates which appear to 

 be connected with the ventral plate of the second metamere, 

 which last structures do not appear to be represented in 

 the other genera. The mandibles and maxillae also closely 

 resemble those of Culex, but the latter have a straighter 

 anterior edge, and are less cut off at the corners. They 

 are fringed with bristles, some of which are of a specialised 



