Chapter XIII 
Anophelinae. External Anatomy of the 
Imago 
The Head. —Is composed mainly of the two large 
compound eyes. These meet below and approach one 
another very closely above. 
The following are the usual names for the different 
regions of the head (Fig. 50) 
1. The nape : the extreme back of the head. 
2. The occiput : the portion behind the eyes. 
3. The vertex : the space between the eyes. 
4. The frons : the space in front of the eyes. 
5. The gena : the side of the head below the 
eyes. 
The frons is triangular in shape, with one angle 
directed downwards. From the upper two angles 
arise the antennae, and from the lower projects the 
clypeus, lying over the base of the proboscis. 
The Clypeus I—Projects over the base of the pro¬ 
boscis as a prolongation of the frons. The character 
of the clypeus is of generic importance, e.g ., 
1. Hairy in Culex ; 
2. Scaly in Stegomyia ; 
3. Nude in Joblotia. 
The Antennae. —Consists of fourteen to sixteen 
