416 NEW YORK STATE MUSEUM 



Air tube 4 or 5 times as long as broad (6) 



5 Tube concave, the tip wider than tlie terminal portion. 



Spines of tube mostly with a single basal branch territans 



Tube regularly tapered, smallest at the tip. Spines of the 



tube 3 to 4 branched nigritulus 



■6 Anal segment without hair tufts anteriorly of the transi- 



versely barred area (7) 



Anal seginent with hair tufts on the ventral line up to the 

 base dyari 



7 Lateral comb of the eighth segment a patch of spines; tube 



brown p i p i e n s 



Lateral comb a row of bars; air tube black melanurus 



8 Apex of the labium i-ounded [pl.44, fig.l]. Antennae whit- 



ish on basal half r e s t u a n s 



Apex of labium pointed [pl.45] cantans 



9 Lateral comb of the eighth segment a patch of small spines 



three or more rows deep (10) 



Lateral comb a few spines on a single or partly double row (13) 



10 Anal segment with hair tufts before the barred area (11) 



Anal segment without tufts before the barred area (12) 



11 The spines of the air tube prolonged into setae; tube about 



three times as long as wide; the antennal tuft is at the mid- 

 dle of the joint consobrinus 



The air tube with spines, anal segment broadly plated, .canadensis 



12 Antenna with a small tuft a little before middle of the joint. 



Air tube about two and a half times as long as wide; 



lateral comb about three rows deep bimaculatus 



Antenna with a single inconspicuous hair instead of a tuft. 

 Air tube not over twice as long as wide; lateral comb 

 about five rows deep atropalpus 



13 Anal segment with hair tufts before barred area (14) 



Anal segment without tufts before ban-ed area (16) 



14 Comb of eighth segment of separate nearly simple spiues, 



the spiues of the air tube each with three teeth sylvestris 



Comb of eighth segment either toothed or digitate (15) 



15 Comb of eight segment composed of spines with finely digi- 



tately divided tips; antenna with a single long seta instead 



of a tuft triseriatus 



Comb of conspicuously toothed spines, joined on a weak 

 basal plate. Antenna with a small hair tuft j a m a i c e n s i s 



16 Coml") of eighth segment of nearly simple, thorn-shaped 



teeth sollicitans 



Comb of eighth segment of pectinated spiues in an incom- 

 plete double row .t a e n i o r h y n c h u s 



The pupae resemble each other so closely that I have been 

 unable as vet to tind satisfactory characters to distinguish them. 



