368 



A Monograph of Culicidae. 



spot at the middle, becoming wider behind the middle with the sides 

 often separated from the central part by a narrow white line, lighter at 

 the sides, with yellowish or golden scales. Pleura thickly clothed with 

 white scales. The denuded thorax shows a median narrow brown line 

 bordered with a lighter almost plumbeous one on each side. Abdomen 

 brown, with a broad white band, somewhat expanded laterally, at the 

 base of the segments. Yellowish-white scales are scattered over the 

 abdomen, while clusters almost form a median stripe, which is more 

 apparent in bred or unabraded specimens. Ventral surface clothed with 

 white scales. Legs dark brown ; femora yellowish, lighter beneath and 

 almost black at apex. Anterior and mid tibiae lighter beneath, posterior 

 tibiae show dark purple reflections in sunlight. Tarsi unicolorous, 

 almost black ; ungues unidentate. Wings large, thick, venation strongly 



Fig. 147. 

 Comb of C. cinereoborealis. (After Felt.) 



marked ; petiole of first submarginal cell almost as long as cell ; posterior 

 cross- vein less than its own length from the nearly equal mid cross- vein. 



d . Head, similar in colour to that of female ; the antennae and palpi 

 uniformly brown ; thorax with brown spots more extended, more golden 

 and yellowish scales, and with fewer white scales laterally and on the 

 pleura. Abdomen more slender than in the female ; basal bands narrower, 

 with very few scattered yellowish scales, numerous long flying hairs 

 becoming quite dense at apex. Legs long, same colour as female ; first 

 segment of posterior tarsi almost as long as tibiae ; posterior ungues equal, 

 unidentate ; the fore and mid feet bear one large claw with two teeth and 

 a smaller one with one tooth. Wings longer and narrower than in the 

 female ; petioles of the first and second submarginal cells longer than 

 cell, posterior cross-vein about its own length from mid cross-vein. 



Length. — 7 mm. 



Habitat — Albany, U.S.A. 



Time of appearance. — May. 



Larva. — Length, -fg inch ; head light or yellowish brown, widest just 

 behind the black eyes ; antennae nearly straight, almost cylindric, slightly 



