THE FLEAS OF NORTH AMERICA 107 



Range. — Northern North America, including Greenland. 

 Hoplopsyllus glacial Is glacialis and H. glacialis lynx are very close 

 to each other, and according to Kohls (-54, P- 2019) — 



the only difference between the two appears to be in size, glacialis lynx being 

 notably smaller. However, on the grounds of host relationships and geographical 

 distribution, it is probably desirable for the present, ar least, to retain the 

 subspecific distinction. 



HOPLOPSYLLUS (EUHOPLOPSYLLUS) GLACIALIS LYNX (Baker) 



Pulex lynx Baker. 1904, U. S. Natl. Mus. Proc. 27: 383. pi. 10. figs. 7-11, and 



pi. 11, figs. 1-2. 

 Hoplopsyllus glacialis lynx Wagner. 1936. Canad. Ent. 68: 194. 

 Hoplopsyllus lynx I. Fox. 1940, Fleas of Eastern United States, p. 15, pi. 4, 



figs. 11, 13. 



Type host. — Lynx canadensis Kerr (Canada lynx). 



Type locality. — Moscow, Idaho. 



Range. — United States. Canada, and Alaska. 



This variety is very close to Hoplopsyllus glacialis glacialis, but it 

 is considerably smaller than the latter. The type host undoubtedly 

 is not a natural host of H. g. lynx. Xatural hosts are rabbits. 



Hoplopsyllus (Euhoplopsyllus) glacialis foxi Ewing 



Hoplopsyllus foxi Ewing, 1924. Parasitology 16: 350. 



Hoplopsullus poiccrsi C. Fox, 1926, Pan-Pacific Ent. 2: 184, figs. 8-9. 



Hoplopsyllus minutus C. Fox. 1926, Pan-Pacific Ent. 2: 185, figs. 6, 10. 



Type host. — Sylvilagus hachmani (Waterh.) (cottontail rabbit). 



Type locality. — San Francisco. Calif. 



Range. — Known only from California. 

 - Hoplopsyllus glacialis foxi is distinguished from the other two 

 varieties of H. glacialis in haying the posterior process of the clasper of 

 the male almost twice as long as the anterior process instead of being 

 only about one and a third times as long. The synonymy here given 

 under foxi is that of Kohls (64 , p. 2020). Hoplopsyllus minutus 

 C. Fox appears to have been based on a dwarfed specimen of foxi. 



The Genus Ctenocephalides Stiles and Collins 



(Fig. 12, F) 



Ctenocephalus Kolenati, 1859 (not Hawle and Corda, 1847), Fauna des Altvaters, 

 Briinn, p. 66. Type, Ctenocephalus novemdentatus Kolenati (by subsequent 

 designation). 



Ctenocephalides Stiles and Collins. 1930. U. S. Pub. Health Serv. Rpts. 45 : 1308. 

 Type, Pulex canis Curtis (by original designation). 



This generic name was proposed to take the place of Ctenocephalus 

 Kolenati, which is preoccupied by Ctenocephalus Hawle and Corda, 

 1847. 



Front with anterior margin rounded. Frontal tubercle absent. Genal lobe 

 not extending downward so as to produce a ventral marginal angle. Genal 

 comb present, about horizontal and extending anteriorly along ventral margin 

 of gena to frontogenal angle, spines of genal comb heavily pigmented and 

 sharply pointed apically. Upper margin of antennal fossa in male with patch 

 of microsetae. Eyes large, black. Labial palpus 5-segmented : anterior margin 

 thickened, well sclerotiz j <i : fifth segment not equal to II. III. and IV taken 

 together. Episternum III divided into upper and lower parts by a horizontal 

 suture. Pronotal comb present, composed of heavily pigmented spines, sharply 



