FISHES. 315 



.OoBEGONUS QUADEiLATERALis Eicb. Whiteflsh {Sigi of Eussians). 



32854. (65.) Nulato, Yukon Kiver, March, 1878. 



Slender Whitejish. — Below white; sides to lateral line light flesh color, approaching roseate. 

 Scales with fine specks, which make the color darker; above lateral line olive with silvery and steel 

 blue luster. Lower fins orange shaded. Tail and dorsals olive. 



32855. (50.) Unalakleet River, January 30, 1878. 



Slender WMtefish, — This specimen was obtained of a native, who said they were abundant 

 at this time (January 30, 1878) in the river, but do not stay until spring. The fish is remarkably 

 slender, and has a very pointed snout, which I have seen in no other whiteflsh. The color of the 

 back is the usual olive and the ventral surface white. On the sides between the white and olive 

 and underlying, but nearly disguising the latter color, is a band of salmon-reddish the entire length 

 of body, and occupying about one-fourth. the surface of each side. A very beautiful and graceful 

 species. 



This species is conflned to fresh-water streams and lakes, only rarely occurring about the 

 limits of tide-water, so far as I could learn. It is abundant from the rivers tributary to Kotze- 

 bue Sound to the Kuskoquim Eiver, and from the vicinity of the coast of Bering Straits well up 

 the Yukon. With the other Whiteflsh they run up the Yukon and its tributaries in June, and in 

 fall, when the ice covers the streams, they descend to the deeper parts of the streams, and at the 

 latter season are taken in large numbers in fyke-traps. The following description is taken from a 

 fine lot of these fish, taken from a fish-trap on the Lower Anvik Eiver on November 20. The 

 notes were made before the fish had lost any of their life-tints : 



Silvery white on the ventral surface and extending up on the sides to meet the olive-greenish 

 of the dorsum. Entire sides overlaid with a more or less bright rose color of an extremely delicate 

 shade, which shows beautifully upon the silvery background. 



All of the scales on the dorsal surface are bordered with dark, giving a reticulated appearance 

 there. The pectoral, ventral, and anal fins are all fleshy-reddish. 



Tail and dorsal dusky, with fleshy-reddish .shade ; sides of head silvery. In very bright 

 examples the fleshy color on the flns becomes almost blood-red and shades off upon the surrounding 

 scales even from the dorsal fln. 



When viewed at one angle the silvery color on the sides extend nearly to the dorsal Hue, but 

 seen at another angle it only reaches the lateral line. 



Thymallus signifee (Eich.). Grayling (Chu-lulih-pau-g^ulc). 



29950. (253.) Nulato, Yukon River, March, 1831. Grayling. 

 32868, 32869, 32870, 32830. 



(Notes on original Nos. .56 to 60.) 



Grayling. — Nulato and Andraevsky. Yukon Eiver and tributaries. Nos. oQ, 57, and 58,'Nu- 

 lato; 59 and 60, Andraevsky. — The specimens were brought in a good state of preservation, and the 

 following description gives a fair idea of the appearance : Color of all the specimens nearly 

 the same, a shade of dark brouze purplish becoming pale steel-blue or flesh-tinted brown on view- 

 ing from diflerent angles. No. 60 is a trifle lighter colored. The above color extends over the 

 entire dorsal surface, a little darker on back, and fades slowly as it approaches the abdomen. 



Separating the plumbeous-white of the abdomen from the color of the sides is a line of rusty 

 or sometimes ochery-brown, much darker than the adjacent color of the sides. These lines com- 

 mence below the pectorals and extend to/the vent, becoming almost obsolete in some specimens 

 back of the ventrals. 



Extending along the median line of the abdomen from the gular point to near the ventrals is 

 a faint line of brownish. The tail, anal, and pectorals nearly uniform bluish, sometimes appearing 

 nearly black, at others whitish tinted. The ventrals are the same color, with 5 parallel bars of 

 rose pink crossing the open fln at right angles with the body. The first of these bars only borders 

 the anterior edge of the fln. The dorsal becomes proportionally larger in the older specimens. In 

 all it is dark blue with a row of pink, probably crimson, spots extending the whole width of the fln 

 on the membrane between the rays. The spots are brighter colored farther back ou the fin. 



