310 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT 
Fig. 4, a scale from the abdominal region midway between the lateral line and the insertion 
of the ventral fins. 
Figs. 2—4 are magnified views. 
List of specimens. 
Catal. 
No. 
No. of 
spec. 
Age. 
Locality. 
When 
collected. 
Whence obtained. 
Nature of 
specimen. 
Collected by— 
583 
2 
Adult.. 
Astoria, Oregon_ 
1854 
Lt. W. P. Trowbridge. 
Alcoholic. 
Lieut. Trowbridge_ 
2. FARIO TSUPPITCH, Grd. 
Plate LXIX, Figs. 1—4. 
Spec. Char. —Body very much elongated, compressed, fusiform in profile ; head forming about the sixth of the total length. 
Snout rounded, with the jaws sub-equal. Maxillary gently curved, dilated posteriorly, and extending to a vertical line passing 
slightly behind the orbit. Anterior margin of dorsal fin nearer the extremity of the snout than the insertion of the caudal fin. 
Ground color of dorsal region olivaceous, clouded with bluish brown, and scattered about with roundish black spots which 
extend over the dorsal, the adipose, and the caudal fins. Upper surface of head bluish black. Sides and inferior region 
of the body unicolor, yellowish brown ; inferior fins unicolor also. Sides of head yellowish. 
Syn. — Salmo tsuppitch, Richards, Faun. Bor. Amer. IV, 1836, 224.— DeKay, New Y. Faun. IV, 1842.— Storer, Synops. 
1846, 197. 
Fario tsuppitch, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 218. 
Salmon trout, Vernacular ; Slioosldnes, Walla-Walla ; Icquansek, Wasco Indians. 
The general aspect of this fish is very much elongated and quite compressed, the profile 
being sub-fusiform, the depth diminishing but very gradually towards the caudal fin. The 
greatest depth taken in advance of the dorsal fin is contained about six times and a half in the 
total length, whilst the least depth, on the peduncle of the tail, enters in that same length 
about twelve times. The depth is very uniform between the dorsal fin and the head. The 
head, which constitutes the sixth of the total length, is convex superiorly, rounded upon the 
snout, with both jaws equal. The posterior extremity of the maxillary extends to a vertical 
line drawn at a very short distance from the posterior rim of the orhit. The posterior limb of 
that bone is quite dilated and, as usual, rounded ; its teeth are the smallest, that is, more 
slender than even the vomerine and pterygoidian. Along the shaft of the vomer the series 
is somewhat irregular. The orbit is of moderate size and circular in sliape ; its diameter 
entering about five times and a half or six times in the length of the side of the head, and 
about once and a half in advance of its anterior rim. The limb of the preopercle is quite 
dilated upon its convexity; the opercle and sub-opercle both being very well developed, the 
latter being nearly half the size of the former. The branchiostegals are stout, short, and 
flattened, thirteen on the left side and twelve on the right. 
The dorsal fin is a little higher anteriorly than long upon its base ; its posterior margin is 
equal to half its base, whilst the upper margin is sub-concave. The adipose is narrower upon 
its base than upon its middle ; its extremity extends a little more backwards than the tip 
of the posterior rays of the anal. The caudal is broad and well developed, and somewhat 
crescent-shaped posteriorly ; it constitutes the seventh of the total length. The anal is deeper 
upon its anterior margin than long ; its posterior margin, however, being but the third of the 
anterior, the shape of that fin differing considerably from the dorsal, although its external margin 
