171 



The Nervures. — The nervuration of the wing 

 is of considerable importance. Several nomen- 

 clatures are in use. That used in the accompanying 

 diagram is, however, the simplest (Fig. 44). 



In classification, the relative position of the 

 apices of the two forked cells are frequently used. 

 Also the relative positions of the point where the 

 auxiliary vein cuts the costal vein, and the point 

 where the fifth vein cuts the posterior margin. 

 As a rule, the position of this first point is much 

 nearer the base than that of the second point, but 

 in a few instances, e.g., My. shiensis, they almost 

 coincide. 



Also the positions of the upper, middle, and 

 cross veins. It will be found, however, that even 

 in the same species there is no constancy in these 

 latter, and thgy can hardly be given as of specific 

 importance as has been done. Donitz has made 

 the same criticism, and indeed, finds that the 

 position in each wing of the same mosquito may 

 be different. 



The Legs 



These consist of the following segments : — 



1. Coxa and trochanter. Small pieces at 

 the origin of the legs (Fig. 42). 



2. Femur. 



3. Tibia. 



4. Tarsus, consisting of five segments, the 

 last of which carries the claw or ungues. 



Fig. 45. Fore Ungues of M. funesta ( $ ) the larger Uniserrate. 

 Fore Ungues of M. rossii ( $ ) the larger Biserrate. 

 {After Theobald) 



