FISHES. 315 



CoREGONUS QVADRiLATEEALis EicL. WLitefisb [Sigi of Eussiaus). 



32854. (Go.) Nulato, Yukon Kiver, March, 18T8. 

 ISlemler Whitefish. — Below white; sides to lateral line light flesh color, approaching roseate. 

 Scales with flue specks, which make the color darker: above lateral Hue olive with silvery and steel 

 blue luster. Lower fius orauge shaded. Tail aud dorsals olive. 



3-2855. (.50.) Unalakleet River, January 30, 1878. 



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

 at this; time (January 30, 1S7S) iu the river, but do not stay until spring. The lish is remarkably 

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

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

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

 of body, and occni)ying about one-fourth the surface of each side. A very beautiful aud graceful 

 species. 



This si)ecies is conliued 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 Whitefish they run up the Yukon and its tributaries iu 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 iu large numbers iu lyke-traps. The following description is takeu 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 ou the dorsal surface are bordered with dark, giving a reticulated appearance 

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



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

 examjdes the fleshy color ou the fius becomes almost blood-red aud shades ofl' upon the surrounding 

 scales eveu from the dorsal fin. 



When viewed at one angle the silvery color ou the sides extend nearly to the dorsal line, but 

 seeu at another angle it only reaches the lateral Hue. 



Thymallus SIGJNIFER (Eich.). Grayling (Chu-lulh-paii-g'uk). 



29950. (253.) Nulato, Yukon River, Marcli, 1381. Gnayliug. 

 32863, 32869, 32870, 32830. 



(Notes ou original Nos. .56 to GO.) 



Grayling. — Nulato and Andraevsky. Yukon Eiver and tributaries. Nos. 56, 57, and 58, Nu- 

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

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

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

 ing from different augles. No. GO is a trifle lighter colored. The above color extends over the 

 entire dorsal surface, a little darker ou 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 iu some specimens 

 back of the veutrals. 



Extending along the median line of the abdomen from the gnlar point to near the veutrals is 

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

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

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

 the anterior edge of the fin. 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 fin 

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



