102 NATURAL HISTORY OF AQUATIC INSECTS CH. 



Fig. 23.— Larva of Gnat (Culex). 2, head and prothorax, ventral side. The com- 

 pound eyes, the folde^ legs, and other parts of the future (ly are seen through 

 the transparent larval skin ; 3, antenna of do. ; 4, respiratory tube of do. ; 

 5, extremity of respiratoiy tube, end view 



