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. 



2. FARIO TSUPPITCH, G r d . 

 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 tlie 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. — DeKat, New Y. Faun. IV, 1842. — Storer, Synops. 

 1846, 197. 

 Fario tmppitch, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 218. 

 Salmon trout, Vernacular ; SItooshines, 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 orbit. The j)osterior 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 shape ; 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 branch iostegals 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 u})per 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. Tlie caudal is broad and well developed, and somewhat 

 crescent-shaped posteriorly ; it constitutes tlie 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 difl'ering considerably from the dorsal, although its external margin 



