20. Venter of egg bent only slightly near midpoint; shape 

 and re.iculations as in Fig. 206, 222. From flood- 

 plains and woodland depressions sticticus 



Venter of egg bent sharply near midpoint; shape and 

 reticulations as in Fig. 207, 223. From savanna 

 depressions flavescens 



Key +o Species of PSOROPHORA (Eggs) 



1. Dorsoventral profile of egg strongly biconvex, ratio of 



diameter to length less than 1 :2 ( Fig. 224) 2 



Dorsal profile of egg only strongly convex; ratio of 

 diameter to length more than 1;2 ( Fig. 225 ) t 



2. Eggshell having disc of each cell of reticulation with 



Fig. 208-223. — Highly maumtied portions of eggshells of Aides: 208, aegypti; 209. Iriserialus: 21(1, icxaiis: 211, dupreei: 212, 

 cinereus: 213, Irhitlalus: 21-4. sullicitaiis: 215, excrucians: 216, slimulans: 217, filchi; 218, canadensis: 219, aitrijer: 220, dorsalh: 221, 

 ihihaulti: 222, sticticus: 223, flaresce/is. 



47 



