162 THE CANADIAN ENTOMOLOGIST. 



PRELIMINARY STUDIES IN SIPHONAPTERA.— V. 



BY CARL F. BAKER, FORT COLLINS, COLO. 



• Genus Pulex (Division III.) 

 Table of Species. 



A. Head gently and evenly rounded from occiput to mouth ; eyes in- 



anterior half of head, about equally distant from upper and lower 

 edges ; antennal groove in middle of head ; mandibles reaching 



two-thirds of anterior coxcC B. 



AA. Head more or less distinctly angled in front above, not evenly 

 rounded from occiput to mouth ; head combs of 5 to 6 spines ; in 

 anterior tarsi joint i equals 3 ; in middle tarsi joint 2 a little 

 shorter than 5 ; in posterior tarsi joint 2 equals 5 and as long as 3 

 and 4 together, while i is one-half longer than 2 ; abdominal 

 segments with one row of bristles above and below ; posterior 

 femora with a row of bristles on the side .D. 



B. Abdominal segments above each with three rows of bristles, each 



row with 8 to 12 bristles on either side, below two rows, the first 

 with 4 to 7, the second with 6 to 7 bristles on either side ; eye 

 small ; bristles on joint 2 of antennae as long as joint 3 ; maxillary 

 palpi in female with joint 2 two-thirds of 4, and 3 about one-half 

 of 4 ; labial palpi 5-jointed ; head combs with i or 2 spines on 

 either side ; pronotal comb of 20 spines ; in middle tarsi joint 2 

 three-fifths of i, 2 one-fourth longer than 5, 5 more than twice 4, 

 and I as long as 3, 4 and 5 together ; in posterior tarsi joint i as 

 long as 2 and 3 together; 5 a little more than one-third of i, 

 while 2 is more than 3 and 4 together, and more than 4 and 5 

 together ; apical spine on joint 2 of hind tarsi shorter than joint 



3 ; posterior femora without a row of bristles on the side ; colour, 

 ..> light reddish-brown ; length : female, 4 mm gigcts. 



BB. Abdominal segments above each with one row of bristles, 5 to 8 on 

 either side ; below one row of 2 to 4 bristles on either side ; eye 

 very large ; bristles on joint 2 of antennae shorter than joint 3 ; 

 maxillary palpi with joint 2 about equalling 4, and 3 two-thirds of 



4 ; labial palpi 4-jointed ; in anterior tarsi joint 3 three-fourths of 

 2,5 about two and one-half times 4, and less than i and 2 together; 

 in middle tarsi 2 one-half longer than i, 5 two and one-half or 

 three times 4, i about equalling 3 ; in posterior tarsi joint 5 more 



