Systematic Position and Structure 13 



front of the eyes are the antennae. These differ 

 widely in the various forms, and are of specific im- 

 portance at least. They may be stubby, straight, 

 and smooth, with but a few hairs, or only a single 

 hair to represent the tufts ; they may be covered 

 with spinules ; bear a long bunch of many hairs, set 

 in a notch, or not so set ; they may carry on their tips 

 long or short spines; may be curved in a crescentic 

 or even sigmoid form ; may taper gradually from 

 base to tip or narrow abruptly above the notch. 



Beyond the front of the head, when viewed from 

 above, may be seen projecting the mouth brushes. 



Fig. 2. — Mouth brushes of the larva of Culex lerrilans, very 

 greatly enlarged. 



On the under side, just outside of the brushes, are 

 the mandibles, and above these the maxillae with the 

 subtriangular labium between them (see Fig. 3, p. 15). 



