A NEW SPECIES OF NEMATODE WORM FROM THE 



SAGE GROUSE 



By Everett E. Wehr 



Assistant Zoologist, Zoological DiviMon, Bureau of Animul Industry, United 

 States Range Livestock Experiment Station, Miles City, Montana 



On October 18, 1929, three sage grouse {Centrocermis uropha- 

 sianus) were killed on the United States Range Livestock Experi- 

 ment Station, Miles City, Mont. On post-mortem examination two 

 large red nematodes were found coiled underneath the horny lining 

 of the gizzard of one of the birds. On October 26, there were found 

 in the gizzard of another sage grouse killed on Moon Creek, a near-by 

 tributary of the Yellowstone River, 108 additional specimens of 

 this same nematode. This is the first record, so far as the writer 

 knows, of the collecting of a nematode belonging to the genus 

 Hdbronema from the gizzard of a sage grouse. 



HABllONEMA UROPHASIANA, new species 



Specific diagnosis. — Hdbronema: 



Male. — 14.5 millimeters long by 324/i wide. The cuticle over the 

 entire body is distinctly cross-striated. The head (figs. 1 and 3) 

 is provided with four lips, two large laterals, a dorsal, and a ven- 

 tral. Each of the lateral lips is divided externally into three lobes, 

 each lobe bearing a more or less distinct tooth on its inner surface. 

 Slightly external to the row of teeth there appears to be a horizon- 

 tal row of two or three small papillae. The dorsal and ventral lips 

 have keel-like projections. The lateral ala is 4.16 millimeters long. 

 It arises about 277/x from the anterior extremity of the body. The 

 cervical papillaB, which are indistinct except under high magnifica- 

 tion, are a short distance anterior to the ala, about 245^ from the 

 head end. The narrow chitinized pharynx is 50/x long. The esoph- 

 agus is 3.02 millimeters long and is surrounded by the nerve ring 

 367/t from the anterior extremity of the body. The caudal extremity 

 is coiled spirally. The caudal alas are broad; they are supported by 

 eight pairs of pedunculated papillae and bear four or five pairs of 

 sessile papillae (fig. 2) arranged as follows: Four pairs of preanal, 

 two pairs of adanal, and two pairs of postanal pedunculated papillae, 

 and four or five pairs of small sessile ventral papillae at the caudal 



No. 2869.— PROCEEDTNGS U. S. NATIONAL MUSEUM, VOL. 79, ART. 3. 

 52398—31 -, 



