102 THE MOSQUITOES OF NEW JERSEY 



trap records, Table I. Anopheles quadrimaculatus appears to serve 

 as the principal vector of malaria in New Jersey. No outbreaks seem to 

 have occurred where this species is either absent, or present in small 

 numbers. Malaria in New Jersey was very abundant in the early days 

 but, although still sporadically present, has mostly disappeared. Win- 

 ter is passed in the adult stage in such sheltered places as it can find. 

 Winter mortahty is high.] 



HABITS OF THE EARLY STAGES 



[In general like other species. The breeding places are similar, but 

 this form also occurs in brackish water on the salt marshes, hence has a 

 somewhat wider range and adds the positive danger of disease to the 

 disadvantages of an undrained marsh. 



The larva of this species may be distinguished from the larva of 

 Anopheles punctipennis by the fact that the living form shows six pairs 

 of dorsal float hairs on the abdomen while punctipennis shows only 

 five pairs of float hairs.] 



Anopheles walkeri Theobald 

 Walker's Anopheles 



DISTRIBUTION AND CHARACTERIZATION 



[Eastern North America. It occurs sporadically; sometimes and in 

 some places in great numbers. It was trapped in northeastern New Jer- 

 sey in the summer of 1938. A total of 10,254 specimens were trapped. 



This mosquito is easily confused with An. quadrimaculatus and 

 doubtless has been so identified in New Jersey collections. It is, however, 

 readily distinguished from this species by the silvery white rings at the 

 articulation of the last two segments and at the tip of the last segment 

 of the palpi. Anopheles quadrimaculatus has uniformly dark brown 

 palpi.] 



DESCRIPTION 



The following description is taken from Howard, Dyar, and Knab 

 (14): 



"Fem.ale. Proboscis long, straight, slender ; labellae long, lanceolate, 

 brown, with small outstanding black setae ; vestiture appressed, black. 

 Palpi slightly shorter than the proboscis, uniform, slender, clothed with 

 narrowly elliptical scales, roughened on basal third, black, with dull 

 silvery white rings at middle of long joint, at the articulations of last 



