MILNER ON THE GRAYLING. 739 



snout to the dorsal flu is .31. The distauce from the snout to the anal fin 

 is .74. The distance from the snout to the origin of the ventrals is .47. 

 The len.tith* of the caudal peduncle is .10. 



The length of the head is .19A of the length without caudal ; the dis- 

 tance from snout to nape is .13^ of the same. The width of the head is 

 .44f ot the lengtli of the head ; the width of the interorbital area is .262.; 

 the length of the maxillary is .3U|; the length of the snout is .24^ ; the 

 length of the opercnlum is .25^; the diameter of the orbit is .25. 



Br., 9 ; D., 24 ; A., 3-11 ; C, 8-18-7 ; P., 15 ; V., 10 ; scales on lateral 

 line, 98; transverse rows of scales above lateral line, 8; below lateral 

 line, 11-4. 



The distance from the snout to the dorsal is less than in T. tricolor 

 and the adipose fin is more slender. The maxillary is shorter than in 

 T. tricolor or T. montaniisf. The thickness of the head is less than in 

 T. montanus, and the mandible is longer. 



Teeth are present upon the preaiaxillaries, maxillaries, vomer, pala- 

 tines, mandible, pharyngeals, and tongue. 



There is a small naked space on the branchial isthmus. 

 Length, 17.5 inches. 



National Museum, No. 3333. Locality, Fort Simpson, British Amer- 

 ica. Collector, Bernard 1?.. Ross. 



The two skins labeled " St. Michael's, Norton Sound, Alaska," differ 

 considerably from the species just described in the greater width of head 

 and interorbital area, and mai'kedly in the width of the operculum. In 

 all other characters, they are apparently similar. Additional specimens 

 are needed to determine its relation to this species. 



Thymallus tricolor Cope. I 



Thymallus tricolor Cope, Proc. Acad. Nat. Sci. Philadelphia, 1805, p. 

 80 ; Giinther, Cat. British Museum, vol. G, p. 201 ; Cope, Prelim. Pep. U. 

 S. Geol. Siirv\ Montana and Portions of Adj. Terr., p. 469. § 

 Body elongate, subcompressed, highest at the anterior portion of dor- 

 sal flu. The greatest height of^body eqnal to the length of head. The 



* Measured from a point vertical to tbe last ray of the anal tin. 



t Described on page 741. 



t The prominent characters of T.vnJgaris are the straight profile of the head; the 

 muzzle is prolonged and tlattened, the lower jaw shutting easily within the premaxil- 

 hiries : the maxillary is short and wide, reaching but little beyond the edge of the eye ; 

 the mandible is dilated at its anterior end ; the orbital opening is acute iorward ; the 

 dorsal tin is snuiller ; the scales are arranged in parallel linear rows; the striaj are 

 coarser; on the anterior of the thoracic region between the pectoral fins and for nearly 

 half the distance to the insertion of the ventrals, the skin is naked. The scales in the 

 vicinity of this region are very minute, and increase in size rather rapidly upon the 

 sides and toward the ventral fins; the scales of the lateral line are larger; and the 

 appendages to to the ventrals are longer. 



^\ Popultfr descriptions have been given in the following journals : Mather, (quoted in 

 editor's article,) Forest and Stream, (N. Y.,) vol. ii, .June 4, 1874, p. 2()5, (with plate;) 

 Mather, (quoted in editor's article,) American Agriculturist, (N. Y.,) vol. xxxiii, p. 333, 

 Sept., 1874, (with plate;) Mather, Live Stock Journal, (Buflalo, N. Y.,) vol. v, p. 214, 

 July, 1874, (with plate.) 



