THE CANADIAN ENTOMOLOGlSf. 163 



than one-half of i, 2 as long as 3 and 4 together ; posterior femora 

 with a row of bristles on the side C- 



C. Head combs of 6 to 9 spines, pronotal comb of 14 to 18 spines ; iq 



anterior tarsi joint 3 about equals i ; in middle tarsi 2 equals 5 or 

 less ; in posterior tarsi i as long as 2 and 3 together, and 2 less 

 than 4 and 5 together ; apical spines on joint 2 of hind tarsi 

 as long or longer than joint 3 ; male claspers oval, the broad 

 portion pointing up and back, thickly finely haired around the 

 upper end; colour, dark brown above, lighter below; length: 

 female, 2.5-3 i^""^- j male, 1.5-2 mm serraticeps. 



CC. Head combs of 2 to 3 spines, pronotal comb of 6 spines ; in anterior 

 tarsi joint 3 longer than i ; in middle tarsi joint 2 one-fifth longer 

 than 5 ; in posterior tarsi i about one-third longer than 2, 2 one- 

 fourth longer than 5 ; apical spine on joint 2 of hind tarsi longer 

 than joints 3 and 4 together ; male claspers inverted shoe-shaped, 

 the toe pointing backward, moderately hairy above ; colour, dark 

 brown ; length : female, 3 mm. ; male, 2.5 mm erinacei. 



D. Maxillary palpi with joint 2 as long as 3 and 4 together, and 3 three- 



fourths of 4 : head obtusely angled in front above ; eye large, at 

 the middle, and nearer the upper than the lower edge ; antennae in 

 posterior half of head ; bristles on joint 2 as long as joint 3 ; labial 

 palpi 4-jointed ; mandibles reaching to end of anterior trochanters; 

 pronotal comb of 16 spines ; in anterior tarsi joint 3 three-fourths 

 of 2, 4 shorter than 3, 5 as long as 2, 3 and 4 together; in middle 

 tarsi 3 slightly longer than 4, i much longer ; apical spine on 

 second joint of posterior tarsi longer than joiiits 3 and 4 together ; 

 dorsal rows of bristles on abdominal segments with 5 to 8 bristles 

 on either side, ventral with 2 to 4 on either side ; male claspers as 

 in erinacei, except not so rounded, and very thickly hairy 

 above ; colour, dark brown ; length : female, 1.7 5-2. 2 5 mm. ; male, 

 1.5 mm inaequalis, n, sp. 



DD. Maxillary palpi with joints of equal length ; head sharply angled in 

 front above ; eye moderate, in anterior half of head, and about 

 equally distant from upper and lower edges ; mandibles reaching  

 to two-thirds of anterior coxa? ; pronotal comb of 12 spines; in 

 anterior tarsi joint 5 nearly as long as 2, 3 and 4 together ; in 

 middle tarsi 3 as long as 4, i a little longer ; male claspers narrow, 

 curved backward, thickly haired above ; colour, yellowish brown ; 

 length, 2 mm goniocephalus. 



Pulex gigas, Kirby. 



1837. Kirby, Faun. Boreali-Amer. IV., p. 318, pi. 6, fig. 9 (P. gigas). 

 I have referred to this species, specimens taken on cotton-tail rabbit 



at Lansing, Michigan. The spines on the cheeks are easily overlooked, 



