TWO NEW SPECIES OF TREMATODES OF THE GENUS 

 PAEAMETORCHIS FROM FUR-BEARING ANIMALS 



By Emmett W. Price 



Of the Zoological Division, Bureau of Animal Industnj, United States Depart- 



vicnt of Afiriealturc 



In this paper two trematodes which appear to be new species are 

 described. These flukes belong to the family Opisthorchiidae Braun, 

 1901, and to the genus ParametorcMs Skrjabin, 1913. The first of 

 these species was forwarded to the Bureau of Animal Industry, 

 October 13, 1927, by Dr. J. E. Shillinger, of the Bureau of Biological 

 Survey, who collected them from the gall bladder of a silver fox 

 from Wisconsin. For this species the name ParametorcMs infer- 

 medius is proposed. The second species, comprising about a dozen 

 specimens, was collected from the gall bladder of a mink by Dr. 

 Ronald G. Law, of the Experimental Fur Farm, Kirkfield, Ontario, 

 and forwarded to the Bureau of Animal Industry for identification 

 on February 2, 1929. For this species the name Paramet orchis cana- 

 densis is proposed. 



The genus to wliich these species obviously belong was proposed 

 by Skrjabin (1913) and is characterized as follows: 



Genus PARAMETORCHIS Skrjabin, 1913 



Genenc diagnosis. — Flattened, moderate-sized distomes, attenu- 

 ated anteriorly and rounded posteriorly. Cuticle spiny. Suckers 

 equal in size and weakly developed ; acetabulum at the border of the 

 first and second fourth of body length. Pharynx and a smaller 

 esophagus present. Intestinal ceca extend to posterior end of body. 

 Testes lobed and arranged tandem in posterior half of body. Uterus 

 rosette-shaped, in anterior half of body, surrounding the acetabulum. 

 Vitellaria lateral of uterus, in anterior half of body, and uniting in 

 front of uterus. Ovary lobed, cephalad of testes. Receptaculuni 

 seminis moderately large, lateral of ovary. Parasites of the gall 

 bladder of mammals. 



Type species. — ParametorcMs complexus (Stiles and Hassall, 

 1894). 



No. 2809.-PROCEEDINGS U. S. NATIONAL MUSEUM, VOL, 76. ART. 12 

 64438—29 2 



