MALARIA 



223 



recognized by their position on a surface. Their 

 body forms a large angle with the surface, and the head 

 is on a line with the body. The ordinary mosquito, 

 Culex, stands parallel with the surface w r ith the head 





FIG. 65. Egg of Culex (a) laid together in "small boat;" those 

 of Anopheles (6) separate and rounded. (From Kolle and Hetseh.) 



bent down. Furthermore, the wings of the Anopheles 

 are furred on the flat surface, w r hile the Culex wings 

 are only fitted with widely set, fine hairs on the edges. 

 There are many other differences, but these will 

 suffice as general guides. The female mosquito bites 



a b 



FIG. 66. Larva of Culex (a) hangs nearly at right angles to water 

 surface; those of Anopheles (6) are parallel to the surface. (From 

 Kolle and Hetsch.) 



a malarial person and receives the parasites into her 

 stomach. Here they undergo reproduction by a sexual 

 process, and appear in her salivary gland in a condi- 

 tion ready for transmission to the next person bitten. 



