294 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



2a. Coregonus williamsoni cismontanus Jordan. 



Whitefish of the Upper Missouri Basin. 



Coregonus williamsoni cismontanus Jordan, Bull. U.S. Fish Comm., rx, 1889, 49, pi. 

 9, figs. 8, 9, Horsethief Springs Creek, a tributary of Madison River, Montana. 



In the headwaters of the Missouri Eiver is found a scarcely tangible 

 variety of Williamson's whitefish which has received the above name. 

 It is distinguished from C. williamsoni by the more slender body and 

 somewhat lower fins. Head, 5; depth, 5 to 5£; pectoral, 1£ in head; 

 ventral, If; longest dorsal ray, li. Scales in lateral line, 80 to 90. 



A specimen 9 inches long, from Rig Goose Creek, Sheridan, Wyo., 

 gives the following measurements: Head, 4| ; depth, 4J; eye, 5; snout, 

 3f ; maxillary, 4£; mandible, 2|. Scales, 9-86-8. Length of pectoral, 

 1| in head; ventral, 1£; anal, 1J. 



Differences between this and typical williamsoni are not marked, 

 and the variety should probably not be recognized as having any real 

 existence. 



This whitefish has been collected by us in the following Missouri 

 Basin localities : Red Rock River, Red Rock, Mont. ; Beaverhead River, 

 Dillon, Mont.; junction of Gibbon and Firehole rivers, Yellowstone 

 Park; and Big Goose Creek, Sheridan, Wyo. It has been obtained by 

 Dr. Jordan from Madison River below the falls, and from Horsethief 

 Springs Creek, Montana. The National Museum contains specimens 

 from Gallatin River, Montana (W. C. Harris); Gallatin and Madison 

 rivers (J. E. Curtis), and Montana (E. Wernigk). 



From these records it would seem that the center of abundance of 

 this variety of whitefish is in the three forks (Jefferson, Madison, and 

 Gallatin) which unite to form the Missouri northwest of the Yellowstone 

 Park. The most eastern locality from which it is yet knowu is Sheri- 

 dan, Wyo., where numerous young individuals were collected in July, 

 1893, by Prof. IT. O. Cox, for the United States Fish Commission. These 

 specimens were obtained in Big Goose Creek, which is tributary to 

 Tongue River. Though the streams in the Black Hills to the east of 

 Tongue River are clear and cold and well adapted to the habits of this 

 fish, somewhat extended investigations in that region in 1892 and again 

 in 1893 failed to discover any whitefish there. 



3. Coregonus kennicotti Milner. 



Kennicott's Whitefish; Broad Whitefish; Muksun. 



Coregonus kennicotti Milner. in Jordan & Gilbert, Synopsis, 298, 1883, Fort Good 

 Hope, British America. (Type, No. 8971.) 



Head, 5§; depth, 4|; eye, 5i; snout about 4; maxillary, 4. D. 11; 

 A. 14. Scales, 10-87 to 90-10. Gillrakers, 6 or 7+14, short and slender, 

 14 in eye. Head very blunt, premaxiliaries wide and vertically placed; 

 mouth inferior, the high, blunt snout but little projecting; maxillary 



