saliva containing the parasites is injected into him in the blood-suck- 

 ing process. The parasites then will attack the red blood corpuscles 

 of that person and cause a series of changes which produce malarial 

 fever. 



In biting, the 

 Anopheles is eas- 

 ily distinguished 

 from the other 

 species, for it 

 holds its body al- 

 most perpendic- 

 ular to the biting 

 surface (practic- 

 ally stands on 

 its head), as in 

 contrast to oth- 

 er mosquitoes 

 which hold the 

 body almost par- 



Fig. 13 — Life History of Malarial Mosquito 

 Compare with figures 1 and 6, noting position of larvaf 



allel to the skin surface in biting. The Anopheles breeds in clear, 

 clean water. It may find its way to maturity in a rain-barrel or tub or 

 along the grassy edge of a stream or pond. Breeding is continuous 

 from spring until fall, but is especially noted from mid- July to early 

 September. 



Methods of Control 



Since each group of mosquitoes is different in the places it seeks 

 for development, naturally the work of control also is divided into 

 distinct classes. All successful mosquito control work is directed 



against the breeding place. In the 

 larval state, one can kill a thousand 

 mosquitoes with the same amount 

 of effort and expense that it costs 

 to kill one on the wing. Although 

 the same fundamental principles 

 underlie all anti-mosquito work, 

 each branch nevertheless presents 

 its own problem. Each one is here 

 discussed in turn. 



On the Salt Marsh 

 The salt marshes of New Jersey 

 cover thousands of acres, and ac- 

 count for many millions of mos- 

 quitoes. After heavy rains, the 

 water from the surrounding up- 

 lands settles on these marshes. Af- 

 ter abnormal high tides, the water 

 brought up is not all drawn off on 

 the low tide, but remains in all the 

 holes or depressions on the meadow 



Fig. 14 — Malarial Mosquito 

 (Anopheles quadrimaculatus Say.) 



Dittinctivee marks: Palpi three-fourths 

 «■ long as beak: No white bands: Four 

 blackish spots on each wing. 



u 



