28 Parasites infesting Domesticated Black Foxes in Canada 
SIPHONAPTERA. 
Ctenocepholus canis (Curtis, 1826). Body of host. 
NEMATODA. 
Eucoleus aerophilum (Creplin, 1839). Trachea and large bronchi. Eggs found constantly 
in trachea, oesophagus and faeces. 
Belascaris cati (Schrank, 1788) 
Bela.s'caris marginata (Rudolphi, 1802) Small intestine. 
Toxascaris limbata (Railliet and Henry, 1911) 
Uncinaria polaris (Looss, 1911). 
Sometimes B. marginata penetrates the bile duct 
and develops in the liver. Immature ascarids found 
in fox pups less than one week old. Quite common 
to find intestinal canal from stomach to large colon 
completely packed with ascarids in young foxes 
only three to four weeks old. One seldom finds 
more than one or two ascarids in adult foxes. 
Small intestine. 
Ascocotyle longa (Ransom, 1920). 
Echinochasmus sp. 
TREMATODA. 
Small intestine. 
Small intestine. 
