502 Bulletin 47, United States National Museum, 



Represented in the upper Sacramento and its tributaries, and probably 

 in most of the eastern tributaries of the Sacramento and San Joaquin, by 



7811). SALMO IRIDEUS SHASTA (Jordan). 



(McCLOUD .RIVER RAINBOW TROUT.) 



Head 4 ; depth 3* ; D. 11 ; A. 11 ; scales 20 to 24-145-20, 65 before dor- 

 sal. Body comparatively short and deep, compressed, varying consider- 

 ably, and much more elongate in the males than in the females. Head 

 short, convex, obtusely ridged above. Mouth smaller than in most other 

 forms of the genus, the rather broad maxillary scarcely reaching beyond 

 eye except in old males ; maxillary If in head in males, 2 in females. 

 Eye larger than in typical gairdneri, 5 in head. Vomerine teeth in two 

 irregular series. Dorsal fin moderate ; caudal fin distinctly though not 

 strongly forked, more deeply incised than in typical mykissj pectoral 1& 

 to If in head. Scales comparatively large. Coloration bluish above, the 

 sides silvery ; everywhere above profusely but irregularly spotted, the 

 spots extending on the sides and on the vertical fins ; head well spotted ; 

 dorsal, caudal, and usually upper ray of pectoral spotted; spots on cau- 

 dal small ; belly nearly plain ; fins usually not red ; almost always a dash 

 of red between branches of lower jaw ; males and usually females also 

 with red lateral band and blotches ; much red on cheeks and opercles ; 

 belly partly red in males. Length 10 to 30 inches. Weight 2 to 8 pounds. 

 Streams of the Sierra Nevada, from Mount Shasta southward, best known 

 from McCloud River; the limits of its range not well known ; abundant, 

 and subject to many variations ; also introduced into Truckee River and 

 into many eastern streams, this form being the usual " Rainbow Trout" 

 of fish-culturists. (Named for Mount Shasta.) 

 Salmo irideus, or Rainbow Trout of most writers and especially of fish-culturists; not Salmo 



irideus, GIBBONS, which is based on coastwise specimens. 

 Salmo gairdneri shasta, JORDAN, Thirteenth Biennial Rept. Fish Comm. California, 1894, 142, 



with plate, McCloud River, at Baird, Shasta County, California. (Type, No. 903, 



L. S. Jr. Univ. Mus. Coll. Stone.) 



Represented in the lower waters of Kern River on the west slope of 

 the Sierra Nevada by 



781c. SALMO IRIDEUS GILBERTI (Jordan). 



(KERN RIVER TROUT.) 



Entirely similar to the McCloud River Trout, except that the scales are 

 smaller, as small as in typical myTciss, in about 165 transverse series. The 

 body is robust, the mouth moderate; back and sides profusely spotted; 

 old specimens with more or less orange between the branches of the lower 

 jaw, this mark faint or wanting in the young. Upper ray of pectoral 

 spotted. Kern River, California, abundant in the river channels, below 

 the waters inhabited by subspecies agua-bonita. Large, reaching a weight 

 of 8 pounds. Our specimens from south fork of Kern River, at Soda 

 Springs, California. (Named for its discoverer, Dr. Charles Henry 

 Gilbert.) 



Salmo gairdneri gilberti, JORDAN, Thirteenth Biennial Rept. Fish Comm. California, 1894, 143. 

 with plate, South Fork of Kern River at Soda Springs, California. (Type, No. 

 1511, L. S. Jr. Univ. Mus. Coll. Gilbert.) 



