141 



of biting they take no part, but are then separated 

 from and lie at right angles to the proboscis. 



The expanded ends of the palpi in the male 

 Anophelines are even more conspicuous than the 

 plumose antennae. 



The Prothorax. The main portion of the thorax 

 is mesothoracic ; anteriorly, however, there is a 

 collar-like piece of chitin, the prothorax. To this are 

 attached two moveable bodies, the patagia. 



The Mesothorax (Fig. 50). The scutum of the 

 mesothorax forms the large globular mass of the 

 thorax. Behind the scutum, and just behind the 

 origin of the wings, is a transverse bar of chitin, the 

 scutellum. Behind the scutellum is a convex tri- 

 angular area extending as far as the first abdominal 

 segment, the 'post- scutellum (Fig. 50). 



The scutellum and post-scutellum are of im- 

 portance in classification. 



THE WING 



The wings shew : 



1. An anterior straight, thick, and strong border 

 or costa. 



2. A posterior curved and thin border, carrying 

 a fringe. 



3. Nervures, or veins. 



The Costa. In Anophelines is generally covered 

 in part with white, and in part with black scales, form- 

 ing the spotted margin. 



The Fringe. In Anophelines has most frequently 

 Jight and darker portions, the number and position of 

 which are of some specific importance (Fig. 59). 



The Nervures. In classification, the relative 

 positions of the apices of the two forked cells are 



