742 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



snout is .24i| ; the length of the operculum is .24J; the diameter of the 

 orbit is .25f . 



Br., 9; D., 22 ; A.,3-11 ; C, C-19-7 ; P., 16 ; V., 10; scales in lateral 

 line, 95 ; transverse rows of scales above lateral line, 8 ; below lateral 

 line, 10-5 ; caecal appendages, 18. 



The height of the body is greater than in the other American si)ecies ; 

 the length of the head is greater than that of T. signlfer. The distance 

 from the snout to the dorsal is greater than in the latter species and 

 slightly less than iu T. tricolor. The furcation of the caudal is less than 

 in T. tricolor; the adipose fin is more slender iu form; the head is 

 thicker ; the length of the maxillary is less, as is also the diameter of 

 the orbit. 



Teeth are x)reseut on the premaxillaries, maxillaries, vomer, palatines, 

 mandible, and pharyngeals, and a group of seven or eight are found 

 upon the tongue. 



The scales to some extent assume the linear arrangement characteriz- 

 ing T. vulgaris and not discernible in T. tricolor. The scales in the tho- 

 racic region are slightly smaller than in the latter species. A small 

 naked space is to be seen on the branchial isthmus. 



Length, 11.75 inches. 



National Museum, No. 13090. Locality, Cainp Baker, tributary of 

 the Missouri liiver, Montana Territory. Collector, J. Scott Oldmixou, 

 acting assistant surgeon, United States Army. 



MATERIAL. 



Thymalhis vulgaris Nilss. — One specimen, 10 inches long, presented b^- 

 H. Denny, Leeds, England; two specimens, 12| inches in length, from 

 Eud()Ii)h Hessel, Offenberg, Gernmny. 



Thymallus signifer Eich. — One specimen, — carefully-stuffed skin, in ex- 

 cellent condition, — 17} inches long, from B. R. Eoss, Hudson Bay Com- 

 pany's factor. Fort Simpson, B. A. ; one specimen, 7-} inches long, iu 

 alcohol, from same locality and collector ; three specimens, alcoholic, 

 in bad condition, from Yukon Eiver, Alaska, W. H. Dall ; two speci- 

 mens, — differing slightly from the others, — labeled " St. Michael's(?), 

 Norton Sound, Alaska, H. M. Bannister." 



Thymallus tricolor Cope. — Seventy-five specimens from Au Sable 

 Eiver, Michigan, from 6 to 11 inches in length ; collected by D. H. Fitz- 

 hngh, jr., and James W. Milner. 



Thymallus montanns, sp. no v. — Three specimens, collected for Smith- 

 sonian Institution, at solicitation of Surgeon J. F. Head, U. S, A., by 

 Acting Assistant Surgeon George Scott Oldmixou, Camp Baker, Mon- 

 tana Territory ; three specimens, (arrived in bad condition,) collected by 

 C. A. Hart, acting assistant surgeon United States Arm^^, at the request 

 of Surgeon J. F. Head, from Fort Shaw, Montana Territory ; three speci- 

 mens, collected by Dr. F. V. Hayden, United States geologist, at Willow 

 Creek, headwaters of Missouri Eiver, Montana Territory. 



