OF WASHINGTON. 51 



Mouth hairs diffusely tufted, folded inward in retraction. 



Air tube short, sessile; larvae floating at the surface of water. 

 Eyes longitudinal. 



Abdominal hairs unequal; ventral brush normal, large. 



Body paler, the head contrasting darker. ..Anopheles punctipennis. 



Body darker, the head not contrasting Anopheles maculipennis. 



Air tube longer than wide; larvae floating below the surface of water. 

 Eyes transverse. 



Air tube elongate, four times as long as wide. 



Lateral comb of eighth abdominal segment a patch of simple 

 spines. 

 Antennae with tuft beyond middle of joint, large. 



Head square; air tube very long Culex territans. 



Head rounded; air tube moderate Culex pipiens. 



Air tube short, less than four times as long as wide. 

 Anal processes slender or reduced. 



Lateral comb a patch of simple spines. Culex canadensis. 



Culex can tans. 

 Culex sollicitans. 

 Lateral comb a row of few large spines, with 



toothed basal plates Culex coiijinis. 



Anal processes dilated. 



Lateral comb a row of several spines, with 



elongate basal plates Stegomyia fasciata. 



Eyes rounded or longitudinal. 



Abdominal hairs equal, ventral brush absent. 



Anal processes dilated (2); head without conspicu 

 ous hairs Aedes smithii. 



Abdominal hairs unequal; ventral brush normal. 

 Anal processes slender, normal (4); head 



with four large coarse black hairs Uranotcenia sapphirina. 



Mouth hairs in a pair of remote pencils, folded outward, in retraction. 

 Eyes longitudinal; air tube longer than wide. 



Anal processes very long, tapering at tip ; ventral 



brush present Psorophora ciliata. 



This communication occasioned much interest and was dis 

 cussed at length by several of the members and others present. 

 Mr. Kotinsky said he had reared larvae of Anopheles punctipennis 

 from pools on Mount Pleasant, D. C. Some of the larvae were 

 of a greenish color. Prof. Smith said that, in his experience, 

 Anopheles bred everywhere. A. punctipennis was the common 

 species in New Jersey. A. maculipennis was much less common 



