164 THE CANADIAN ENTOMOLOGIST. 



and often broken entirely off. It is one of the largest and most well- 

 marked of the known North American fleas. Ritsema, to whom the 

 species was unknown, suggested that it might possibly be identical with 

 Hystrichopsylla obtusiceps. This was, however, merely a guess, as it 

 does not bear the slightest resemblance to that species. It was orginally 

 described from specimens taken in Canada. 



Pulex serraticeps, Gervais. 



1832. Duges, Ann. d. Sci. Nat. XXVII., p. 157, pi. 4, fig. 2, 5-9 

 (P. canis). 



1835. Bouche, Nov. Act. Acad. Leop. Carol. XVIL, i, p. 505 

 (P. felis). 



1844. Gervais, Hist. Nat. des Insectes. Apteres. Ill, p. 371, pi. 48, 

 fig. 8 (P. serraticeps). 



This is the common cat and dog flea, well-known from all parts of 

 the world. Besides various wild cats and dogs, it has been reported from 

 Herpestes ich?ieufnon, Foetorius putorius, Hyaena striata, Lepus thnidus, 

 and Procyoii lotor. It is also stated to occasionally sip human blood. I 

 have specimens from various parts of North America, and also from 

 Europe. 

 Pulex ermacei, Bouche. 



1835. Bouche, Nov. Act. Acad. Leop. Carol. XVIL, i, p. 507 

 (P. erinacei). 



I have received a series of specimens of this species from Ur. 

 Taschenberg, taken in Germany on Erinaceus europeus, which is the only 

 known host. 



Pulex inaequalis, n. sp. 



Mr. A. B. Cordley sent me a series of specimens of this species 

 taken on cotton-tail and jack rabbits, near the Grand Canon in Arizona. 

 It seems to be the North American representative of go?iiocephalus, but 

 differs very widely from that species as described and figured by Dr. 

 Taschenberg. A variety of this species, which I will call var. simplex, 

 occurs on a species of Lepus in Michigan. It may eventually prove to 

 be a good species, but it bears such a close resemblance to inaequalis 

 that I cannot at this time recognize it as more than a variety of that 

 species. The slightly larger size, 2.5 mm., the head combs of 8 spines, 

 and the pronotal comb of 14 spines, will separate it from the typical form, 

 while the proportions of the tarsal joints and other details are nearly 

 identical. 

 Pulex gotiiocephahis, Taschenberg. 



J 880, Taschenberg, Die Flohe, p. 82, pi. IIL, fig. 20 (P. gonio- 

 cephalus. 



Recorded from Europe as occurring on hares and rabbits, Capra 

 ibex, and Canis vulpes. 



[to be continued.] 



Mailed June 5th, 1895. . ' 



