MOSQUITOS OR CULICIDAE OF NEW YORK STATE 279 



bl)b Abdomen without cross band of whitish scales 



c Thorax vittate or distinctly striped with white or yellow 



d Thorax with 2 broad yellowish stripes, 1 each side of a central 



dark brown one trivittatus, p.333 



(Id Thorax with 1 median creamy gray stripe s e r r a t u s , p.334 



ddd Thorax with broader median, creamy gray stripe, species 



smaller dupreei, p.334 



€G Thorax not vittate with white or yellow 

 d Some of the claws toothed 



e Scales on side of mesonotum white triseriatus, p. 335 



ee Scales on side of mesonotum golden yellow . . . a u r i f e r , p.336 

 dd Claws simple melanurus, p.337 



Key for determining Culex larvae 



Characters employed in earlier published keys have been used 

 wherever they could be employed to advantage. 



« Air tube long, at least 4 times as long as the diameter of its base 



& Air tube very long, slender, slightly constricted in the middle; anten- 

 nae white banded territans, p.307 



bft Air tube very long, stout, tapering uniformly 

 c Comb scales 60, pecten teeth 3-4 branched ...salinarius, p.332 



cc Comb scales about 80, pecten apparently simple d y a r i , p.306 



6&6 Air tube about 5 times the width of its base, tapering 

 c Pecten teeth pale, divided into 3-5 long, slender processes 



d Antennal tuft before the middle restuans, p.325 



dd Antennal tuft at outer third pipiens, p.328 



cc Pecten teeth almost black, 20, with small basal dentitions; comb 



scales about 25 (See also p.381) f i t c h i i , p.281 



ca Air tube very short, not more than li/^ to 2 times as long as broad 

 & Pecten teeth dentate on both sides ; comb with 16-24 scales ; head 



maculate .taeniorhynchus, p.301 



bft Pecten teeth dentate on one side only 

 Antennal tuft normal 

 d Comb scales 28-40, pecten teeth about 14, head generally immacu- 

 late sollicitans, p.294 



dd Comb scales 5, pecten teeth 7-9 serratus, p.334 



cc Antennal tuft reduced to a single hair ; pecten extending nearly to 



apex of air tube ; comb scales about 46 atropalpus, p.305 



caa Air tube moderate in length, from about 2 to over 4 times longer 

 than its greatest diameter 

 & Comb scales not more than 10 

 c Comb scales quadrate, with a very long median spine and shorter 

 lateral ones 

 d Comb scales 5-8, attached to a slight band; pecten teeth 5-8, divid- 

 ing into 2-4 very long, slender spines '.discolor, p.207 



dd Comb scales 7, in a curs^ed row, with 3-4 pecten teeth, each with 

 a long median tooth and several small serrations at its base 



jamaicensis, p.298 



