4^ 



MALARIA 





a/7 



Fig. 17. Mosquito eggs, (a) Cu- 

 licine eggs from 250 to 750 in boats; 



or quite on a line with the bod}', 

 whereas in the Culicine species 

 the beak and body form a dis- 

 tinct angle (Fig. 16). 



The " song " of Anopheles is 

 also less audible ; where the 



Culicine mOSquitO produces a ( b) Anopheline eggs (after Howard) 

 1 singly from 25 to 75. 



high-pitched, tantalizing tone 



and is quickly brushed away, the Anopheles may alight 



and actually proceed to pierce the skin of the victim 



before it is detected. 



The Eggs. — The Anopheline female deposits from 

 25 to 125 eggs, while the Culicines lay 

 from 250 to 750. In the former (includ- 

 ing Stegomyia calopus) the individual 

 eggs lie flat on the surface of the water 

 and often form geometrical figures with 

 each other, owing to their peculiar form ; 



Fig. 18. Individ- . . . , n 



uai mosquito eggs, in the latter (Culicine) (except btegomyia 



(a) Anopheline; (6) , . . . . , r 



Culicine. (After calopus) the eggs are placed on end, form- 

 ing a boat-shaped pack or raft (Fig. 17). 

 On examination it will be seen that the individual 

 Anopheline egg is provided on the upper surface with 

 a pair of floats midway upon cither side, together with 



