Mosquitoes 



9 1 



As these regular rythmical pulsations recur the 

 blood is forced forward through the heart into the 

 head where it bathes the organs there. We shall 

 see in another chapter that the malarial parasite 

 escapes from the walls of the stomach of the mos- 

 quito into the blood in the body-cavity and finally 

 reaches the salivary glands. As the heart is con- 

 stantly driving blood to this part of the body the 

 parasites readily reach the glands from which they 

 finally escape into the new host. 



CLASSIFICATION 



For our purpose it will not be necessary to try to 

 give a system of classification of all the mosquitoes. 

 Those interested in this phase of the subject will 

 find several books and papers devoted wholly to it. 

 It is quite important, however, that we know 

 something about a few of the more familiar groups 

 and kinds, especially those concerned in the trans- 

 mission of diseases. 



THE ANOPHELES 



In pointing out the differences between male and 

 female mosquitoes we noted that in one group, the 

 genus Anopheles, both sexes have long maxillary 

 palpi (Figs. 72, 73). This is the most important 

 character separating this genus from the other 



