518 Bulletin 47, United States National Museum. 



equal. Tongue, in the young, with teeth which are usually absent in the 

 adult. Eye quite large, rather longer than snout, about equal to the inter- 

 orbital space. Scales moderate, easily detached ; lateral line nearly 

 straight; a small bare space behind isthmus. Dorsal fin long and high, 

 its length rather greater than the depth of body, its height varying, about 

 3| in length of body, greatest in the males; adipose fin rather small; 

 anal fin small. Gill rakers slender, short, about 12 below the angle. Back 

 dark, sides purplish-gray; belly blackish-gray, with irregular whitish 

 blotches; five or six deep-blue spots anteriorly; head brown; a blue mark 

 on each side of lower jaw ; dorsal dark gray, blotched with paler, with 

 crossrows of deep-blue spots, edged with lake red ; ventrals striated with 

 reddish and whitish. Length 18 inches. Mackenzie River to Alaska and 

 the Arctic Ocean; Kowak River (C. H. Townsend); abounding in clear cold 

 streams. Our specimens from Fort Simpson. (Signifer, standard bearer.) 



Coregonus sigmfer, RICHARDSON, Franklin's Journ., 1823, 711, Winter Lake, near Fort Enter- 

 prise. 



Coregonus thymalloides, RICHARDSON, Fauna Bor.-Amer., 714, 1836, 'Winter River. 



Salmo (Thymallus) signifer, RICHARDSON, Fauna Bor.-Amer., in, 190. 1836. 



Thymallus signifer, GUNTHER, Cat., vi, 202, 1866; MILNER, Rept. U. S. Fish Comm., n, 1872-73 

 (1874), 788 ; specimens from Fort Simpson, Yukon River, and St. Michaels; JORDAN & GIL- 

 BERT, Synopsis, 302, 1883. 



788. THYMALLUS ONTARIENSIS, Cuvier & Valenciennes. 



(MICHIGAN GRAYLING.) 



Head rather larger, about 5 in length ; scales about the same, 93 to 98 ; 

 dorsal fin lower and smaller than in T. signifer, with 21 or 22 rays. 

 Coloration brilliant, purplish-gray; young silvery; sides of head with 

 bright bluish and bronze reflections; sides of body with small, black 

 irregular spots, most numerous posteriorly in young specimens ; ven- 

 tral fins, ornate, dusky, with diagonal rose-colored lines; dorsal 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 

 minnte 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. Streams of northern Michigan, formerly abun- 

 dant in Au Sable River, Jordan River, and other streams in the Southern 

 Peninsula. Also in Otter Creek, near Keweenaw, in the Northern Penin- 

 sula, whence specimens have been sent us by David D. Banta. These 

 Michigan localities evidently represent a detached colony, left from the 

 former or post-Glacial extension of the range of T. signifer , of which this 

 was once a variety. It is a beautiful and gamy fish, but is being rapidly 

 exterminated through the influence of anglers and sawmills. 

 Thymallus ontariensis,* CUVIER & VALENCIENNES, Hist. Nat. Poiss., xxi, 452, 1848; said to have 

 been brought by MILBERT, from Lake Ontario. 



*The following is a translation of Valenciennes 1 account of Thymallus ontariensis: We have 

 received from Lake Ontario a Thymallus very near to that of the lake of Geneva. It has, however, 

 more naked space under the throat, although less than in Thymallus gymnothorax. The head is evi- 

 dently more pointed, the body more elongate, the dorsal a little longer. The denticulatious of 

 the scales are more pronounced. The colors seem scarcely to differ from those of Thymallus, for 

 our specimens are greenish, with a dozen gray lines along the flanks. The dorsal has 4 or 5 

 longitudinal streaks of red. Our specimens are a foot long; they have been sent by M. Mil- 

 bert.-(Fatenciennes, I. c.) 



