194 



FIELD ZOOLOGY. 



mosquitoes are responsible for the dissemination of 

 malaria. 



All mosquitoes have aquatic immature stages. The 

 eggs are usually laid in rafts, or fiat packs, or in some 

 species, singly, on the surface of ponds or pools or slowly- 



l li h m 



Fig. 8i. — Mouth parts of female mosquito, Culex pipims. A, dorsal aspect 

 B, transverse section; C, extremity of maxilla; D, extremity of labrum-epipharynx: 

 a, antenna; e, compound eye; h, iiypopharynx; /, labrum-epipharynx; li, labium 

 m, mandible; mx, maxilla; p, maxillary palpus. (Folsom, after Dimmock.) 



moving water, and hatch in from one to four days. The 

 larvae are the familiar wrigglers of the rain barrel or the 

 neglected pool. The head is provided with two bunches 

 of vibratile hairs and these, lashing about, keep a current 

 of water constantly moving toward the greedy mouth. 



