W. A. Riley 
93 
Trichosoma plica Rud. 1819. 
(Synonym: Calodium plica Duj. 1845.) 
In the bladder of Vulpes vulpes. 
Uncinaria criniformis (Rud. 1809) Railliet, 1899. 
(Synonyms: Ascaris criniformis Goeze, 1782; Strongylus criniformis Rud. 
1809; Uncinaria stenoceplnala Raill. 1884.) 
Commonly found in European foxes and other Canidae. Also found in the 
Arctic fox V. lag opus. 
Uncinaria polaris Looss, 1911. 
Type host Vulpes lagopus from the National Zoological Gardens, 
Washington, D.C. Stiles (1902), who sent the material to Looss, states that it 
was the cause of an outbreak of uncinariasis among the Arctic foxes of the 
Zoological Garden. 
Riley and Fitch (1921) have reported this species as very common in three 
out of four silver fox ranches examined, and as the undoubted cause of loss, 
not only through death of young stock, but through affecting the quality of the 
fur of infested animals. 
Uncinaria vulpis Frolich, 1789. 
Though the genus Uncinaria is now generally accepted, this, the type 
species, is listed by Looss as a species inquirenda. 
LINGUATULINA. 
Linguatula serrata Frolich, 1789. 
(Synonyms: Taenia rhinaria Pilger, 1802; Fentastoma taenoides Rud. 1819.) 
The adult of this problematic arthropod occurs in the nasal cavities of the 
fox, as well as of the dog, wolf, and a variety of animals. 
ACARINA. 
Demodex folliculorum (Simon, 1842). 
This mite, the cause of the exceedingly stubborn follicular mange of dogs 
is known to occur, though rarely, in the fox. Apparently Gros (1845) was the 
first to definitely list the fox as a host. Since his time there have been a number 
of references, but nothing specific in the literature. 
Sarcoptes scabiei vulpis (Fiirstenberg, 1861) Raill. 
Sarcoptic mange is widely distributed among foxes and fox farmers regard 
it as one of the parasitic diseases that are most to be feared because of its high 
degree of contagiousness. Since the disease was discovered, a thorough-going 
quarantine and inspection of all imported foxes has been maintained. 
Fiirstenberg and also Braun have called attention to the fact that the 
variety occurring in the fox is transmissible to man. Weydemann (1897) 
records a case where a fur dealer and his entire family became infested from a 
