32 



MALARIA 



blood sucking, and even the sexes differ in this respect, 

 i.e. the males of all species are said to lack this habit. 



There are many Dipterous insects which may be 

 mistaken for mosquitoes without more careful examina- 

 tion. The most commonly mistaken forms are mem- 

 bers of the family Chironomidce 

 (Midges) (Fig. 9), which will 

 be found to lack the long, 

 piercing proboscis of the mos- 

 quitoes, and also lack the scales 

 on the wings and the body. 

 Oftentimes there appear in- 

 doors on the windows rather 

 large mosquito-like insects, the 

 crane flies, of the family Tipu- 

 UdcB (Fig. 7). This group of 

 Diptera is also devoid of the 

 Culicid characteristics and fur- 

 ther distinguished by the pres- 

 ence of a V-shaped suture 

 situated dorsallyonthe thorax. 

 The Dixidce (Dixa midges) 

 also resemble the mosquitoes. 

 More closely allied to the mosquitoes and belonging 

 to the same family are the members of the genera 

 Corethra (Fig. 10) and Mochlonyx, but these have a 

 short, blunt proboscis not well adapted for anything 

 but lapping up liquids freely exposed, therefore not 

 of the piercing type. 



Fig. 8. Head and mouth parts of 

 a mosquito with piercing bristles ex- 

 posed. 1, threadlike antennae; 2, 

 compound eyes; 3, clypeus; 4, 

 labium; 5, labella; 6, mandibles; 7, 

 maxilla; ; 8, maxillary palpi ; 9, la- 

 brum ; 10, labrum-epipharynx. 



