10 EXTOMOIOf.ICAI. XFWS. [Jan.. Y>O. 



A Report on the Species of the Siphonaptera found 

 within the Boundaries of the City and 



County of San Francisco, Cal. 

 BY CARROLL Fox Past Assist. Surgeon. I'. S. P. II. & M. 



H. S. 



The following' species of fleas were observed during the ex- 

 amination of some 17.000 specimen? obtained from mammals 

 trapped within the limits of San Francisco. 14. 27^ specimens 

 were examined from Mus : cus, 1842 from man and about 



i.ooo from other small animals, the names of which will be 

 g on under the host. The Pule.v irritaus seems to be a con- 

 stant parasite of the skunk (Mephitis .\\--.ientalis} as of six 

 specimens of that animal examined the Pnle.r irritans has been 

 found more or less numerous on each one. while no charac- 

 teristic species of flea has been encountered. 



Genus PULEX Linnaeus. 

 Pules irritans Linnaeus. 



Hosts: Homo sapiens. Mus ;;/ : ficus, Mus rjttus. Canis 

 familians. Mephitis oceiJentiilis. 



Genus LOEMOPSYLLA Rothsch. 

 Loemopsylla cheopsis Rothsch. 



Hosts: Mus i;. :. .~us. Mus mttns, Mus musculus. 



Genus CERATOPHYLLUS Curtis. 

 Ceratophyllus fasciatus Rose. 



Hosts: .V 5 veg cus, M:-.s rjtt-.-.s, Mus mitseulus. Twice 

 taken from man. twice from Mephitis cc .:cn- 

 s ..nd once from Tlionwmys bottae. 



Ceratophyllus acntus Baker. 



HostiCitettus '.'i. Taken once from mus ;:. veg :ns. 



Ceratophyllus telchium Rothsch. 

 Host: fiw .'.: " 'tiicus. 



Ceratophyllus ignotus Baker. 



Host: Thoii:om\s , Taken once from Scapanus cc 



fomicus. 



