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 
light 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 
