TWO NEW LUNGWORMS FROM NORTH AMERICA RUMI- 

 NANTS AND A NOTE ON THE LUNGWORMS OF SHEEP 

 IN THE UNITED STATES 



By G. DiKMANs 



Associate Parasitologist, Zoological Division, Bureau of Animal Industry 

 United States Department of Agriculture 



Early in 1930 some sections from the lungs of a mountain sheep 

 {Ovis canadensis) from Pikes Peak, Colo., were sent to the Zoologi- 

 cal Division by Dr. George W. Stiles, of the Denver Pathological 

 Laboratory of the Bureau of Animal Industry, with the information 

 that a number of these sheep had died as a result of lungworm 

 infestation. Macroscopically the lesions in the lungs presented an 

 appearance similar to that found in sheep lungs infected with Muel- 

 lerius capillans. Microscopic examination demonstrated that the 

 lungworms present belong to a species not previously described. 

 It is, therefore, here described as a new species. 



Owing to their location in the parenchyma of the lungs and the 

 difficulty involved in their removal from the tissues, no entire speci- 

 mens were collected. The largest single piece obtained was part of 

 a male, the fragment measuring 8 millimeters in length. 



PROTOSTRONGYLUS STILESI. new species 



Plate 1 



Specl-jic diagnosis. — Protostrongylus : Male: Length uncertain, but 

 more than 8 mm.; width, loOju, to 160/^ immediately in front of the 

 bursa. The esophagus is 235ja to 270/li long by 50/^ wide at its base, 

 where it narrows in joining the intestine. 



The spicules are equal and are 300/x to 340^ long; the spicular 

 sheath begins about 50/a to 60/a from the proximal end and extends 

 to well below the distal termination of the spicules; the sheath is 

 supported by a series of digitations, which reach a length of about 

 23/x in the widest portion of the sheath. The digitations extend to 

 about 40/* from the distal end of the spicules. The telamon roughly 



No. 2884.— Proceedings U. S. National Museum, Vol. 79, Art. IB 



59930—31 1 



