the state of New Jersey which transfers malaria from infected to 

 well persons. At this point it should be said that a well person can 

 obtain the disease of malaria only through the agency of the mosquito 

 and that of all the species of mosquitoes within the state this is the 

 only one which is responsible to any considerable extent for the 

 transfer of malaria. 



This mosquito also passes the winter as an adult female in cellars 

 or other sheltered places. The eggs are laid singly or loosely grouped 

 on the surface of the water. From fifty to seventy-five seems to 

 be the usual number. Its life cycle is similar to that of pipiens, with 

 the exception that the larvae when resting do not hang head down- 

 ward, but float with the body almost parallel to the water surface 

 The adult is readily distinguished from all other mosquitoes by the 



fact that the palpi 

 (slender organs, one 

 on each side of the 

 beak), are three- 

 fourths as long as the 

 beak, whereas those of 

 other species are only 

 one-fourth as long 

 It is brownish black 

 in color and has four 

 brownish black spots 

 on each wing. This 

 mosquito also forces 

 its way eagerly into 



Fig. 11 — {above). Cellar g 

 Excavation in Cran- 



Temporary pools of this 

 kind are among the 

 worst breeding places 

 of house mosquitoes. 



Pig. 12— (to the right). 

 Inspector, with mo- 

 tor-cycle EQUIPMENT, 

 OILING SEWER CATCH 

 BASIN IN ATLANTIC 

 CITY. 



the house and is a particularly unwelcome visitor in the sickroom. 

 If the quadrimaculatus bites a person whose blood is 

 infected with the malarial parasite it may get some of 

 the parasites with its meal. These parasites will then undergo a com- 

 plete development within the mosquito's body and eventually will ap- 

 pear in the saliva. If perchance, after this stage is reached, the same 

 mosquito in its quest for food bites a healthy person, some of the 



10 



