DIPTERA 



133 



scribe any but the most common and easily recognized 

 forms. 



83. Culicidae. The Mosquitoes, which form this family, 

 may be recognized by 

 their slender bodies, 

 long legs and by the 

 fringes of scales which 

 occur on the margins 

 of the wings and on 

 the wing veins. They 

 are rather below the 

 medium size although 

 there are many flies 

 which are much smaller. 

 The habits of the com- 

 mon forms are well 

 known. One species is 

 directly and solely re- 

 sponsible for the trans- 

 mission of yellow fever from one person to another, and 

 the members of the genus Anopheles are responsible for 

 the spread of malarial fever. Other species have to do 

 with the transmission of sev- 

 eral tropical diseases of man 

 and animals. 



Mosquito larva may be 

 found in the water, usually, 

 but not always, in stagnant 

 water. They are commonly 

 called wrigglers and may breed in any stagnant water, 

 even in what may be caught by an empty tin can in a 

 back yard. (See page 183, Part II, for a further discus- 

 sion of mosquitoes.) 



FIG. 98. The Yellow-fever Mosquito 

 (CuLicidoe). (After Howard, U. S. 

 Dept. Agr.) Greatly magnified. 



FIG. 99. Mosquito Larva or 

 " Wriggle-tail " (Culiddce). 



