MOSQUITO BIOLOGY 71 



[The experience of the last twenty or more years has shown that this 

 species moves several miles from its breeding place, but that such move- 

 ments take place only where intense broods are thrown off from very 

 large breeding places.] 



Culex territans Walker 

 The White-Dotted Mosquito 



DISTRIBUTION AND CHARACTERIZATION 



[North America, east of the plains. Trapped 565 females in New 

 Jersey.] 



It is closely related to pipiens in structure and habits ; without aid of 

 lens no differences can be observed. Distinguished by thorax, which has 

 two or four small white spots on upper surface and sometimes inverted 

 U-shaped mark near base. 



DESCRIPTION OF THE ADULT 



Runs about size of C. pipiens, though usually smaller. Head brown, 

 scattered yellow scales, yellow border to eyes. Proboscis, antennae and 

 palpi of male fuscous; palpi whitish beneath at bases of apical joints. 

 In female palpi dark brown, grayish at apex; fourth joint shorter and 

 retracted; antennae and proboscis also dark brown. 



Thorax brown; many scattered yellow scales over surface; two or 

 three equally spaced stripes of black bristles down center. Two white 

 spots on middle of dorsum almost always present ; two other patches of 

 white often situated more laterally and posterior of spots ; inverted U 

 broken at middle, near base. Femora and tibiae brown, lighter beneath 

 and at basal part of femora ; knees distinctly white and tarsi blackish 

 throughout. Claws same as in C. pipiens; anterior and middle unequal, 

 one-toothed, posterior and all those of female equal and simple. 



Abdomen blackish brown, with pale yellowish bands narrow in female 

 and broader in male. 



HABITS OF THE ADULT 



So far as the adult is concerned everything that has been said of 

 pipiens applies to this form as well. It seems to occur throughout the 

 state, but is not quite so common as pipiens. When specimens are rubbed 

 or have been in alcohol, there is no way of determining them positively 

 as distinct from pipiens. 



