46. SALMOXID.E TIIYMALLUS. 
303 
line nearlj’ straiglit. A small bare space behind isthmus. Dorsal fin 
long and high, its length rather greater than the depth of body, its 
height varying, greatest in the males; adipose fin rather small; anal 
fin small. Gill-rakers slender, short, about 11 below the angle. Color- 
ation brilliant, (in var. tricolor) purplish gray; young silvery; sides of 
head wuth bright bluish and bronze reflections; sides of body with 
small, black, irregular spots, most numerous posteriorly in young speci- 
mens; ventral fins ornate, dusky, with diagonal rose-colored lines; dor- 
sal with a black line along its base, then a rose-colored one, then a 
blackish one, then rose-colored, blackish, and rose-colored, the last 
stripe continued as a row of spots; above these is a row of dusky-green 
spots, then a row of minute rose-colored spots, then a broad dusky area, 
the middle part of the fin tipped with rose; anal and adipose fins dusky; 
central rays of caudal pink, outer rays dusky. Head 4f; depth 4g. 
D. 20; A. 11; scales 8-00-0. L. 18 inches. I^'orthern Michigan to 
Montana, northward to Alaska and the Arctic Ocean; abounding in 
clear, cold streams in suitable locations. Professor Milner (Eej)!. JJ. S. 
Fish Com. 1872-’73, 740, et seq.) recognizes three distinct si^ecies, which 
seem to us rather as varieties of one species. These are — 
Var. si^Baifer Ricli. 
From British America and Alaska. Has the scales smaller, (Lat. 1. 
98), the maxillary shorter, and the head rather less than one-fifth the 
length; the dorsal rays are perhaps more numerous, and the fin in the 
males much higher. 
{Coregomis signifer Ricli. Frankliu’s Journ. 1823, 711: Salmo (Thgmallus) signifer 
Rich. Fauna Bor.-Amer. iii, 190; Giinther, vi, 202; Miluer, Rept. U. S. Fish Com. 
1872-73, 738.) 
Var. ti’BCoHoB’ Cope. — Michigan Grayling. 
From various streams in the northern part of the southern peninsula 
of Michigan. Has a longer head than the preceding, forming a little 
more than one-fifth the length, and the scales larger, 90-92 in the lat- 
eral line. 
(ThyynaJhts tricolor Cope, Proc. Acad. Xat. Sci. Phila. 186.V, 80 : Thymalliis tricolor 
Giinther, vi, 20l: Thgmallus tricolor Miluer, Rept. U. S. Fish. Com. 1872-73, 739, and 
of late writers ou angling generally.) 
Var. nioiita.iBS9S Milner. — Montana Grayling. . 
From the headwaters of the Missouri. Similar to tricolor.^ but has the 
body deeper, the depth being about 44 in the length. 
{Thymallus montanus Milner, Rejit. U. S. Fish Com. 1872-73, 741, 1874.) 
