GEOLOGIGAL SURVEY OF THE TERRITOEIES. 469 



ity like types ; that from Montana different in coloration. It is a bright 

 green, with numerous blackish speckles on upper surfaces, and brown 

 interscapular spots 5 below uniform. 



Ohoeophllus tetseeiatus, Wied; Selcecetes, Baird. 



Carrington's Lake, Yellowstone Basin. 

 Spea bombifeons, Cope. 



Blackfoot Fork. 



Eana halecina, Bosc. 

 Fort Hall, Idaho. 



Eana peetiosa, B. and G., (United States Exploring Expedition; 

 Herpetology, p. 20.) 



Pleasant Valley, Montana. 



This frog is a near ally of the European B. teiiqjoraria, and is, as 

 Girard remarks, distiuguished from the other west-coast species {B. 

 aurora, B. and G.) by its much shorter limbs. The present species was 

 originally found at Puget's Sound, Washington Territory. 



Eana septenteionalis, Baird, (Proc. Acad. Nat. Sci., Phila., 1854, 61.) 

 Abundant; Oarrington's Lake, Yellowstone Basin, and Fish Creek, 

 Montana. 



PISCES. 



ISOSPONDYLT. 



CoEEGONUg ViLLiAMSONn, Girard ; the Eocky Mountain white fish. 



Thymalltjs teicoloe. Cope, (Proc. Acad. Nat. Sci., Phila., 1865, p. 

 80; Gunther, Catalogue Brit. Mus., VI, 201.) 

 Specimens from Yellow Creek and the Gallatin Fork of the Missouri in 

 Montana. This species was originally discovered in the Grand Eiver, 

 Michigan. It seems to be a rare fish east of the Mississippi; but my 

 friend, J. Dickinson Sergeant, informs me that it has been found abund- 

 antly in a stream in the northern part of the peninsula of Michigan. 

 The number of specimens brought by Dr, Hayden from the head-waters 

 of the Yellowstone indicates that this region is its home. They main- 

 tain well the characters by which it was originally distinguished from 

 the T. vulgaris and T. sigmfer. The muzzle is shorter and the gape ot 

 the mouth larger than in the former ; the maxillary bone is narrower 

 and longer, reaching to below the middle of the pupil instead of to near 

 the front of the orbit. The length of the head equals the depth of the 

 body and enters the length without caudal fin, 4.5 times. There is some 

 variation in the radial formula as follows : D. 20-22 ; A. 13-14. Scales, 

 8-9 — 86-90 — 10-12. In the younger specimens the small blue spots 

 tend to form short longitudinal bars. 



Salmo, Linn. 



The species of this genus, found in the streams rising in the Eocky 

 Mountains, are numerous, and, as elsewhere, nearly allied. Those I 

 have observed in Dr. Hayden's collections number three, while a fourth 

 is described by Dr. C. Girard, which I have not met with. The allied 

 species differ as follows. They all belong to the group Salar : 



Depth, 5.75 in length; eye, 4.5 times in head; snout obtuse; 

 caudal fin scarcely emarginate ; Br. IX iS. virginalis. 



