i88 



Thorax and ab- Abdominal scales with dorsal 

 domen \yith patches of small or narrow flat 

 true scales scales ; thoracic narrow curved 



or spindle-shaped Nyssorhynchus 



Abdomen nearly completely 

 scaled with irregular scales 

 and with lateral tufts Cellia 



Abdomen completely scaled with 



large flat scales, as in Culex Aldrichia 



These features are shewn in the accompanying 

 diagram (Fig. 50). Tlie thoracic scales in Cyclolepi- 

 dopteron are not sufficiently hair- like (Theobald). 



Place the mounted or unmounted mosquito 

 under a low power of the microscope, and deter- 

 mine carefully the characters of the hairs or scales 

 on the head, thorax and abdomen. By this means 

 the Anopheline is assigned to its proper genus. 



Fig. 50 Thoracic, Scutellar, Abdominal, and Wing Scales of 

 the Anophelinae (after Theobald) 



