Larvae and Pupae 



81 



for they vary from hour to hour. When the included 

 adult has nearly reached its full development, the pupa 

 is not quite so lively. It abandons its curved posture 

 •vv 



Fig. 16. — Pupae of: a, Psorophora howardii; b, Ochlerotalus 

 dupreei; c, O. triseriatus; d, Culex rest nans; w, water line. (Drawn 

 to scale, greatly enlarged.) 



and becomes almost straight. At times it jerks vio- 

 lently. Finally the skin of the cephalo-thorax bursts 

 open, the head of the imago appears, and the insect, 

 gradually, without visible effort, rises out of the pupa 



