The Mosquitoes of New Jersey 



93 



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^///, 5ALT MARSH '^^y.////. 



Fig. 56. A diagram to illustrate the method of determining mosquito 

 conditions by evening collections of mosquitoes on the wing. The area 

 enclosed in the solid black line is protected. 



* = Collection stations. 



Numerals = number of mosquitoes caught at each station. 



AC = the brown salt-marsh mosquito (Aedes cantator Coq.,). 



AS = the white-marked salt-marsh mosquito (Aedes sollicitans Wlk.). 



A sub. = the brown woods mosquito (Aedes stimulans Wlk.). 



A syl. = the fresh-water swamp mosquito (Aedes sylvestris Theob). 



CP = the house mosquito (Culex pipiens Linn.). 



Let us analyze this diagram and see what it means for each species. The 

 brown salt-marsh mosquito shows heavily along the eastern border and de- 

 creases regularly to the west and northwest. Evidently a brood had invaded 

 the area from the eastern border. Likewise a heavy infestation of the white- 

 marked salt-marsh appears along the southern border and decreases regularly 

 to the northward. Evidently there has been an invasion of this species from 

 the southward. The distribution of the house mosquito is irregular, clearly 

 indicating that overlooked local breeding is responsible. The occurrence of 

 10 brown woods mosquitoes at one collection station indicates the existence 

 of local breeding. The occurrence of i swamp mosquito is too slight to be 

 significant. 



