A NEW SPECIES OF FLUKE, PAEAMETORCHIS NOVE- 

 BORACENSIS, FROM THE CAT IN THE UNITED 

 STATES 



By See-Lu Hung 

 Of Peking, China 



The material lipon which this paper is based was received by Dr. 

 Maurice C. Hall, of the Bureau of Animal Industry, United States 

 Department of Agriculture, from Ithaca, N. Y., and was turned 

 over to me for study. The collection consists of three specimens 

 of a fluke, unstained and mounted on slides in glycerine jelly. It 

 has been necessary to demount, stain, and remount two of the speci- 

 mens in order that certain portions of the internal anatomy might 

 better be seen. Even so, owing to the masses of eggs in the uterus, 

 it has been impossible for me to determine the exact position of the 

 acetabulum and genital pore. I wish to thank Doctor Hall for the 

 loan of the material and Dr. E. A. Chapin for kind assistance. 



The new fluke is much like Parametorchis complexus (Stiles and 

 Hassell). As the type specimen of P. coiu'plexus is available for 

 study, I have made a careful comparison of the two forms and 

 have noticed the following differences: The pharynx in the new 

 species is wider than long, whereas in P. complexus it is longer 

 than wide. In P. complsxus^ the intestinal branches are strongly 

 flexuous, in the other nearly straight. The testes are nearly simple 

 in the new species instead of being markedly lobulate. The vitellaria 

 are connected at their anterior extremities across the dorsal aspect 

 in P. cortvplexus; in the new species there is no trace of such a 

 commissure. Lastly, the eggs are larger in the new species than in 

 P. complexus. Because of these differences I believe that these 

 specimens represent a species new to science and I propose that it 

 shall be called Parametorchis noveboracensis. 



PARAMETORCHIS NOVEBORACENSIS, new species 



Specific diagnosis. — Length 6-6.3 mm. ; breadth 2.2-2.6 mm. ; body 

 linguiform, anterior end pointed, posterior end round. Cuticle 

 covered with spines. The preserved specimens are straw-color. The 



No. 2627.— Proceedings U. S. National Museum, Vol. 69. Art. I 



81496—26 1 



