320 
U, S. P. R. R. EXP. AND SURVEYS-ZOOLOGY—-GENERAL REPORT. 
Specimens of this species were collected by Dr. Geo. Suckley at the Falls of the Missouri 
river, Rocky mountains. 
References to the figures .—Piate LXXII, fig. 1, represents Salar lewisi, two-thirds the size of 
life. Fig. 2, a scale from the dorsal region. Fig. 3, a scale from the lateral line. Fig. 4, a 
scale from the abdominal region. Figs. 2—4 are magnified views. 
List of specimens. 
Catal. 
No. of 
Age. 
Locality. 
When 
| 
Whence obtained. 
Nature of Collected by— 
No. 
spec. 
1 ■ 
specimen. 
592 
2 
Adult. 
Falls of Missouri river. 
1853 
Gov. I. I. Stevens .... 
Alcoholic.; Dr Geo. Suckley. 
2. SALAR VIRGINALIS, Grd. 
Plate LXXIII, Figs. 1—4. 
Spec. Char. —Body sub-fusiform in profile, otherwise compressed ; head comprised about four times in the total length, the 
caudal fin excluded ; jaws sub-equal; posterior extremity of maxillary extending to a vertical line intersecting the posterior rim 
of the orbit. Anterior margin of dorsal nearer the extremity of the snout than the insertion of the caudal fin. Greyish brown 
above, with a purplish reflection and sub-circular black spots ; beneath olivaceous, unicolor. 
Syn. —Salar virginalis, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 220 .—Salmo virginalis, Grd. Mss. 
The body, which is sub-fusiform when seen in profile, is very much compressed ; its greatest 
depth, anterior to the dorsal fin, enters five times and a quarter in the total length, whilst the 
least depth, on the peduncle of the tail, enters about eleven times in that same length. 
The head is suh-conical and proportionally well developed, constituting the fourth of the 
length from the tip of the snout to the insertion of the caudal fin. The mouth is moderately 
cleft, for, the posterior extremity of the maxillary reaches a vertical line drawn immediately 
posterior to the orbit. The teeth are small and acute, a little larger, as usual, on the dentary 
and the tongue than on other hones. They become very exiguous along the posterior portion 
of the maxillary. The snout is obtusely rounded and the jaws sub-equal, with a proclivity of 
the upper jaw to protrude beyond the lower. The eye is large, sub-circular, its diameter 
being contained four times and a half in the length of the side of the head, a little over once in 
advance of the anterior rim of the orbit. The nostrils are large, situated towards the upper 
surface of the head and nearer the eye than the tip of the snout. The opercle is elevated, 
rather narrow, a little wider beneath than above, slightly oblique, whilst the sub-opercle, 
moderate in development, is rounded upon its free margin. The hranchiostegals are nine on 
either side. 
The anterior margin of the dorsal fin is a little nearer the extremity of the snout than the 
insertion of the caudal fin. The fin itself is higher than long, its upper margin being sub- 
convex, and its posterior margin half the height of the anterior. The adipose is very slender, 
its tip being even with the tips of the middle rays of the anal. The caudal is sub-crescentic 
upon its margin ; it is contained seven times in the total length. The anal is sub-concave 
