4G. SALMONID^ SALMO. 
315 
than iu the adult, as iu all trout). Scales moderate, varying' to rather 
small. Back and caudal peduncle profusely covered with rounded 
black spots of varying size; doisal,. caudal, and adipose fin covered 
with small spots about as large as the nostril; a few spots on the head; 
belly rarely spotted; inner edge of the mandibles below with a red 
blotch; sea-run specimens are nearly nniform silvery; males with a 
broad lateral band and patches of light red; extremely variable in color 
and form. Ilead 4; depth 4. D. 10; A. 10. Cceca 43. Scales variable 
in size, 33-lo0-30 to 30-170-30. The common trout of the Bockj^ Mount- 
ains and Cascade region, abounding in all the streams of Alaska, 
Oregon, and Washington, where it descends to salt water, and reaches 
a weight of 20 pounds (Columbia Biver, Charles J. Smith); also in the 
YeUowstone region, the Upper Missouri, the Upper Bio Grande, Colo- 
rado, and the lakes of the Great Basin of Utah, being very abnndant 
in Utah Lake. J7ot common south of Mount Shasta in California. 
This species is ai)parently the jiarent stock, from which our other blac?k- 
spotted trout have scarcely yet become differentiated. Considerable 
local variations occur, esi)ecially in size, coloration, and size of scales. 
The red blotches on the lower jaw between the dentary bones and the 
membrane joining them is vmry constant and characteristic. 
{Salmo purpuratiis Pallas, Zool. Ross. Asiat., iii, 374, 1811-31: Sahno clarlci Rich. 
Fauna Bor.-Auier. iii, 224, 1833 : Faria stellatus Girard, Proc. Acad. Nat. Sci. Phila. 
1850,219: Sahno brevicauda Sucldey, Aun. Lyc. Nat. Hist. N. Y. vii, 308, 1801: Sahno 
gtellatus, (jibbsi, and brevicauda Gunther, vi, 117-120: Sahno clarlci Jordan, Proc. U. S, 
Nat. Mus. i, 77 : Sahno isuppitcli Jordan, Proc. U. S. Nat. iMus. i, 72 ; Fario aurora Girard, 
Proc. Acad. Nat. Sci. Phila. viii, 218, 1856: Salar leicisi Grd. Proc. Acad. Nat. Sci. 
Phila. 1850, 219 : Salar virv/inalis Girard, 1. c. 220 : Sahno carinatus Coiie, Ilaydcn’s Geol. 
Surv. Mont. 1871, 471-472: Sahno Utah Suckley, Monogr. Salmo, 130: Sahno aurora, 
leu'i)si, and virginalis Giinther, vi, 119-123.) 
Var. tootavaea’i Bendire. — Waha Lake Trout. 
Similar to 8. purpuratiis, but with dark spots only on the dorsal, cau- 
dal, and adipose fin, and on the tail behind front of anal, where the 
spots are very profuse, smaller than xnipil. Anterior regions dusky 
bluish, not silver^'; red blotch on inner edges of dentary bones below 
very conspicuous. Head shorter and deeper than in purpuratus, the 
snout shorter and blunter, not longer than eye, which is 4 in head. 
Opercle and preopercle less convex than in purpuratus. Maxillary 2-1- 
in head. Caudal moderately forked. Head 4; depth 4-|. D. 10; A. 11; 
B. 12; Lat. 1. 175. Size small. Asingularly colored local variety, found 
in Waha Lake, Washington Territory, a mountain lake without outlet. 
{Salmo boucieri Beudire, MSS.) 
