Systematic Position and Structure 15 



ules) ; the smaller tufts or those with few hairs are 

 simple or have minute plumules, while the long bris- 

 tles on the same tubercles with the large tufts are fre- 

 quently smooth. The hairs in the row nearest the 

 head (described in the table of larvae on a later page 

 as " thoracic row i") often serve as specific characters. 

 Occasionally the thorax or the whole body may be 

 covered with a growth of minute hairs. 



The abdominal segments are, as a rule, fairly soft, 



Fig. 3. — mn t mandible; /, labium; nix, maxilla of larva of Culex restuans, 

 dorsal view, greatly enlarged. 



