6i 



T/ie Imago. — The imago is the well-known 

 winged insect. The emergence of the imago may 

 be seen on the surface of almost any collection o^f 

 foul water. Shortly after hatching, the insect 

 may be seen resting quietly upon the surface of 

 the water, and does not fly away when disturbed, 

 or only very feebly. For some considerable time 

 after hatching (twenty-four hours) the insects 

 refuse to feed. 



Fig. 13. Heads of Male ( $ ) and Female (?) Culex. 



In the imago there are marked differences 

 between the male and the female insect. 



The Male. — In the male the antennae are 

 markedly plumose. The palps also are long and 

 hairy. The effect is to make the ' head ' of the 

 male mosquito very conspicuous (Fig. 13). 



The male mosquito, with the exception of 

 certain species, does not feed upon blood, and the 

 proboscis is only used to suck in vegetable juices. 

 The male of Stegomyia mosquitoes, however, is said 

 to suck blood like the female. 



The Female. — In the female the antennae are 

 inconspicuous and have only short lateral hairs. 

 The palps are also less conspicuous than in the 

 "male (Fig. .13). 



