108 THE CANADIAN ENTOMOLOGIST. 



PRELIMINARY STUDIES IN SIPHONAPTERA.— III. 



BY CARL F. BAKER, FORT COLLINS, COLO. 



Genus Pulex (conthmed.) 

 Division II. 



Mandibles short, not reaching ends of anterior coxae ; spines in pronotal 

 comb, 14 to 26. Group i. 



Mandibles long, reaching to or beyond ends of anterior coxae ; spines in 

 pronotal comb, 16 to 20. Group 2. 



Table of Species of Group i. 



Spines in pronotal comb, 14 to 20 A. 



Spines in pronotal comb, 24 to 26 ; hind femora with a row of minute 

 bristles on side ; first two or three abdominal segments with minute 

 teeth on disc above ; first claspers of male without short black teeth ;> 

 bristles on second antennal joint shorter than third joint ; length, 

 3-3.5 mm. \ colour dark brown -. avitim. 



A. Abdominal segments each with one row of bristles ; eyes very large, 



longer than third antennal joint, the upper edge extending above 

 middle of head ; bristle on second antennal joint reaching to end 

 of or beyond third joint ; maxillary palpi with joint 2 shorter than 

 4 in male, as long as 4 or longer in female ; head in female evenly 

 rounded from occiput to mouth, in male flat on top, rounded in 

 front; pronotal comb of 14 spines ; first two or three abdominal 

 segments without minute teeth on disc above ; in anterior tarsi 

 joint 5 is as long or longer than i and 2 together and longer than 

 3 and 4 together ; in middle tarsi joint 5 is three times 4 and as 

 long as 2 or longer, while 2 is longer than 1 and as long or longer 

 than 3 and 4 together ; in posterior tarsi last three joints are very 

 slender, 5 about equal to or shorter than 3 and 4 together, 2 equals 

 three times 4, as long or longer than 5 and longer than 3 and 4 

 together, while i is much longer than 5 and nearly three times as 

 wide ; hind femora with a row of minute bristles on side ; colour 

 dark brown; length: male, 2 mm.; female, 2.25-2.5 mm..glacialis. 

 AA. Abdominal segments each with two rows of bristles ; spines in pro- 

 notal comb, 1 6 to 20 B. 



B. Hind femora with a row of minute bristles on side ; eyes small, near 



lower edge of head : antennal groove in anterior half of head ; in 

 anterior tarsi joint 5 is shorter than i and 2 together and shorter 



