64 THE CANADIAN ENTOMOLOGIST. 



BB. Eyes wanting, or very rudimentary ; head and thorax slender ; head 

 usually long, rounded in front, vertex often more or less produced ; 

 combs on head and pronotum, and sometimes on abdominal seg- 

 ments, that on the head of not more than four spines on each 

 side Typhlopsylla. 



Genus Fuiex, Linn. 



1746. Linnaeus, Fauna Suecica. 



1832. Curtis, British Entom., IX., No. 417. (Ceratopsyllus.) 



1857. Kolenati, Wiener Entom., Monatsschrift, L, p. 65. (Mono- 

 psyllus.) 



1863. Kolenati, Hor. Soc. Entom., Ross, IL, p. 32, etc. (Trichop- 



sylla, Ctenonotus, Ctenophthalmus, Ctenopsyllus, Ceratopsyllus, and 



Ctenocephalus.) 



Table of Divisions. 



A. Head beneath and pronotum behind without combs of 



spines Division L 



AA. Head beneatn without, pronotum behind, with a comb 



of spines Division H. 



AAA. Head beneath and pronotum, both with combs of 



spines Division HI. 



Division I. — Table of Species.* 



A. Head above sloping obliquely forward, angled in front ; segments of 

 abdomen each with 5 to 6 transverse rows of bristles ; second 

 joint of antennae without long bristles kergiielensis. 



AA. Head above and in front evenly rounded ; segments of abdomen 

 each with i or 2 transverse rows of bristles. 

 B. Segments of abdomen each with 2 transverse rows of bristles ; size 

 large ; length : male, 3 mm.; female, 4 mm.; head behind antennal 

 groove with two rows of numerous long black bristles ; bristles on 

 second antennal joint extending beyond end of third joint ; labial 



*Piilex tuherciilaticeps, Bezzi (Bull, della Soc. Entomo., Ital., XXII., 1890, *' Notes 

 on Some Epizoic Insects"), belongs in Division 1, and is nearly related to P. globiceps. 

 It was taken from Ursiis arctoi, and is characterized by the truncated and medially 

 tuberculated front, the subequal first and tiflh joints of posterior tarsi, the slightly greater 

 size and other minor details. Its position would be between kergiieleiisis and globiceps, 

 I have been unable as yet to obtain specimens of fleas from bears in this country. It is, 

 however, a well-known fact among hunters in the West that the grizzly and silver-tip are 

 sometimes found "alive" with them. 



