416 XEW 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 t e r r i t a n » 



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

 tube 3 to 4 branched n i g r i t u 1 u s 



6 Anal segment without hair tufts anterioi'ly of the trans- 



versely barred area (7) 



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

 base d y a r i 



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 m e 1 a n u r u s 



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



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



Apex of labium pointed [pl.45] c a n t a n s 



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 c o n s o b r i n u s 



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 Avide; 



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 a t r o p a I p u s 



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



Anal segment without tufts before barred area (16> 



14 Comb of eighth segment of separate nearly simple spines, 



the spines of the air tube each with three teeth s y 1 v e s t r i s 



Comb of eighth segment either toothed or digitate (15> 



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



tately divided tips; antenna with a single long seta instead 



of a tuft t r i s e r i a t u 3 



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 Comb of eighth segment of nearly simple, thorn-shaped 



teeth sollicitans 



Comb of eighth segment of pectinated spines in an incom- 

 plete double row taeniorhynchus 



The pupae resemble each other so closely that I have been 

 unable as yet to find satisfactory characters to distinguish them. 



