Structure of Larvae, 
35 
Fig. 18. 
Larva and pupa of Corethra (greatly enlarged). 
a, larva ; a 1 , enlarged lateral view of head ; c and c 1 , “ floats” ; d, tail; d 1 , enlarged 
lateral view ; d 2 , still further enlarged ray of same ; b, pupa; b 1 , tail fin ; 
b 2 , air-tubes. 
D 
O 
