193 THE CANADIAN ENTOMOLOGIST. 



In 1907 this list was supplemented by the following species taken 

 from rats : 



Pulex irritans, Linn. 

 Loemopsylla (Pulex) cheopis, Roth. 

 Ctenocephalus canis (Curt), Baker. 

 Ceratophyllus fasciatus, Bosc. 

 Ctenopsyllus musculi (Duges), Wagner. 



These were first recorded as rat fleas in Bull. Cal. State Board of 



Health, 1907, III, No. 5, p. 39. 



The list was augmented in 1908 by the species following : 



Argopsylla gallinacea (Westwood), Enderlein. 

 Hoplopsyllus anomalus, Baker. 

 Ceratophyllus ignotus, Baker. 



These three species were recorded in Entomological News, October, 

 1908, pp. 380-382. 



The remaining species, with a few exceptions, were embodied in a 

 report on the Species of the Siphonaptera found within the boundaries of 

 the city and county of San Francisco, by Fox, Jan., 1909, Entomological 

 News, pp. ic-i 1. 



The following compilation constitutes a compendium of the species of 

 fleas, with normal and occasional or accidental hosts. It may be of interest 

 to note that the fleas recorded from rats had been identified after an 

 examination of more than 200,000 rats of the common varieties found 

 locally and taken from ships in the San Francisco harbour. The squirrel 

 fleas were collected from several hundred California ground squirrels. 

 Two species, Ceratophyllus acutus and Hoplopsyllus anomalus, seem fairly 

 constant in the San Francisco Bay region and in the vicinity of Los 

 Angeles. 



Family Rhynxhoprionid.*, Baker. 

 Genus Argopsylla, Enderlein. 



1. — Argopsylla gallinacea (Westwood), Enderlein. 

 1908. — Mitzmain, Entomological News, XIX, No. 8, p. 381. 

 Hosts. — Poultry and farm animals, occasionally man. 

 Region. — Central California, 



