244 



ECONOMIC ENTOMOLOGY 



^SS^- — Laid at night or early morning on the surface of standing 

 water in masses of 50 to 400. Hatch in about 24 hours. * 



Larva. — Large head with a pair of mouth-brushes and a tube at 

 opposite end of body for breathing, not over four times as long as broad; 

 antennae of moderate length with a branch about the middle, bearing 

 a tuft of hairs. Full grown in a week; dirty white, or yellowish. 



Pupa. — A hunched object, floating just below the surface of the 

 water. Duration i to 3 days. 



Number of broods limited only by conditions of temperature and 

 moisture. 



Fig. 154. — The common house mosquito : a, male; 6, female. {U. S. Bur. Enl.) 



Malarial Mosquito (Anopheles maculipennis Meign.). Adult. — 

 Dififers from Culex in being much larger, more slender and with larger 

 legs; wings longer, and more or less spotted with brown or black, and 

 carried flat on the back when not in use; palpi or mouth-feelers as long 

 as the beak in both sexes. (In Culex the palpi are short in the female.) 

 A common malaria carrier. 



E'ggs. — ^Laid singly on surface of water; hatch in 24 to 48 hours. 



Larva. — ^Larva lies flat on surface; tube very short; at first black or 



