MILNER ON THE GRAYLING. 739 



snout to the dorsal fiu is .31. The distfiuce from the snout to the anal fla 

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

 TheHengtli* of the caudal peduncle is .16. 



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

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

 .443 of the length of the head ; the width of the interorbital area is .26| ; 

 the length of the maxilhuy is .30f ; the length of the snout is .24^ ; the 

 length of the operculum is .-5J; the diameter of the orbit is .25. 



Br., 9 ; D., 24 ; A., 3-11; C, 8-18-7 5 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 maxillarj' is shorter than in 

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

 T. Diontanus, and the mandible is longer. 



Teeth are present upon the premaxillaries, 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 E. 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 markedly 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.t 



Thymalhis tricolor Cope, Proc. Acad. Nat. Sci. Philadelphia, 1865, p. 

 80 ; Glinther, Cat. British Museum, vol. 6, p. 201 ; Cope, Prelim. Eep. U. 

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

 Bod3' elongate, sabcom pressed, highest at the anterior portion of dor- 

 sal fin. The greatest height of body equal to the length of head. The 



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



t Described on page 741. 



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

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

 laries ; 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 forward ; the 

 dorsal fiu is smaller ; the scales are arranged in parallel linear rows ; the stria; are 

 coarser ; on the anterior of the thoracic region between the pectoral fins and fpr 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 tins; the scales of the lateral line are larger; and the 

 appendages to to the ventrals are longer. 



'^ Popular descriptions have been given in the following journals : Mather, (([uoted in 

 editor's article,) Forest and Stream, (X. Y.,) vol. ii, .June 4, \ri74, p. 265, (with plate;) 

 ]\Iather, (quoted in editor's article,) American Agriculturist, (N. Y.,) vol. xxxiii, p. 3:W, 

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

 July, 1874, (with plate.) 



