60 REPORT OF STATE BOARD OF FISH COMMISSIONERS. 



DESCRIPTION OF A NEW SPECIES OF TROUT (SALMO 



KAMLOOPS). 



FROM THE LAKES OF' BRITISH COLUMBIA. 

 By David Starr Jordan. 



Salmo Kamloops. Species nova. 



Head 4^ in length to base of caudal; depth, 4^; dorsal rays, 11, not 

 counting the rudiments; anal rays, 11 in one specimen, 12 in the other, 

 besides 3 rudiments; scales, 30-145-26 (in second specimen 135 scales); 

 about 120 pores; length of body, largest specimen, 16i inches; smallest 

 specimen, 15f. 



Body moderately elongated, somewhat compressed, the general form 

 resembling that of a Silver salmon (Oncorhynchus kisutch); jaws in 

 the typical specimens not prolonged, the maxillary extending beyond 

 the eye, its length not quite half the head; snout slightly rounded in 

 profile, the profile regularly ascending; eye large, about as long as snout, 

 4^ times in head; teeth moderate, some of those in the outer row in 

 ■each jaw moderately enlarged; teeth on tongue and vomer, as usual 

 in Salmo gairdneri; opercles striate, not much produced backward; 

 branchiostegal rays, 11 on each side; dorsal fin rather low, its longest 

 ray slightly greater than the base of the fin. If in head; anal fin lower 

 and smaller than usual in Oncorhynchus, but larger than usual in the 

 trouts, its outline slightly concave, its longest ray greater than the base 

 of the fin and a little more than half-head; adipose fin moderate; caudal 

 fin rather broad, distinctly forked, its outer rays about twice inner; 

 pectoral fins rather long, 1-J in head; ventrals moderate, 1| in head; 

 gill-rakers comparatively short and few in number, about 6+12, or 11. 



Coloration dark olive above, bright silvery below, the silvery color 

 extending for some distance below the lateral line, where it ends abruptly ; 

 when fresh the middle of the sides in both specimens was occupied by a 

 broad band of bright light rose-pink, covering about one third of the 

 total depth of the fish; back above with small black spots, about the 

 size of pin-heads, irregularly scattered, and somewhat more numerous 

 posteriorly; a very few faint spots on upper part of head; dorsal and 

 caudal fins rather closely covered with small black spots similar to those 

 on the back, but more distinct; a few spots on the adipose fin, which is 

 edged with blackish; lower fins plain; the upper border of the pectoral 

 dusky; a vague dusky blotch on the upper middle rays of the anal; 

 ventrals entirely plain. 



The intestines had been removed, and so no account can be given of 

 the pyloric coeca. 



The existence of this fish was first known to me from conversation 

 with Mr. A, C. Bassett, of Menlo Park, California, a very enthusiastic 

 angler, who had taken the fish in the Kamloops Lake in British Colum- 

 bia. I was unable to identify the fish from the account given by Mr. 

 Bassett. In going for a summer outing in July, 1892, Mr. Bassett went 



