280 NEW YORK STATE MUSEUM 



GG Comb scales rather broadly spatulate at the base, few, arranged 

 in a curved line 

 d Comb scales 5, pecten teeth 7-9, minutely serrate near middle 



serratus, p.334 

 dd Comb scales 6, pecten teeth 12-16, stoutly toothed near middle 



abserratus, p.329 

 ddd Comb scales 8-10 in a curved line ; 12 pecten teeth with short 



basal spines dupreei, p.334 



66 Comb scales ranging from 10 to about 24 

 c One or more pecten teeth widely separated from a continuo'us row 

 d 2 rows of slight tufts of hairs on the dorsum of the air tube; 

 comb scales 14-16, vtsually four pecten teeth widely separated 

 from the remainder of the row ....cinereoborealis, p.312 

 dd No such dorsal tufts on the air tube 

 e Air tube slender, tapering equally, the continuous pecten extend- 

 ing only to the basal 5th of the air tube; pecten teeth 2-3 

 toothed; comb scales 10-14 (Smith 18-20) 



sylvestris, p.289 



ee Air tube stouter, slightly swollen, continuous pecten extending 



to the basal 3d of the air tube; pecten teeth 1-2 toothed; comb 



scales 14, in a somewhat tiiangular patch, spatulate, each 



with a stout, rather short, terminal spine; pecten teeth 15-18, 



each with 2 or more basal teeth '. .i m p i g e r\ p.316 



cc Pecten in a continuous row, distal teeth not widely separated 

 d Comb scales digitately divided, 12, in an irregular double 



row t r i s e r i a t u s , p. 335 



dd Comb scales elliptic, with a terminal spine, 14-22 



trivittatus, p.333 

 666 Comb scales over 25 

 c Antennal tuft before or at the middle 

 d Pecten pale, prolonged into setae ; comb scales digitately divided 

 e Comb scales 50, pecten teeth with 1 or 2 basal processes 



absobrinus, p.318 

 ee Comb scales 40, pecten teeth with 2 or 3 basal processes 



magnipennis, p.322 

 dd Pecten not as above 



e Tuft of antenna reduced to a single hair; comb scales about 

 46 in 5 rows; several pecten teeth widely separated from the 



remainder atropalpus, p.305 



ee Tuft of antennae normal 



f Comb scales with stout apical spine, 28-64, narrowly spatu- 

 late at base ; tip of antennae dark. ...canadensis, p.303 

 ff Comb scales each with a stout apical spine, broadly spatu- 

 late at base 

 g Antennae moderately long with a slight swelling near the 

 base; 26-50 scales in the comb and 16-24 pecten teeth; head 

 immaculate cantans, p.284 



^Aedes fuscus larvae also come out here and may be distinguished from this 

 Culex by the comb scales being in a somewhat irregular line, the pecten teeth 

 usually with a single tooth, the apical 2 cu- 3 pecten teeth distant and somewhat 

 flattened. * 



