315 



COREGONUS QUADEiLATERALis Eicb. Wliitefish (Si gi of liiissiaus). 



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



tSleitder Wliitejiiih. — Below wbite; sides to lateral line ligbt flesh color, approacbiug roseate. 

 Scales witb flue specks, which make the color darker; above latei'al Hue olive with silvery aud steel 

 blue luster. Lower flus orauge shaded. Tail and dorsals olive. 

 3'.'855. (50.) Uualakleet River, January 30, 1878. 



Slender Whitejlsh. — This specimen was obtaiued of a native, who said they were abuudant 

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

 slender, and has a very pointed snout, which I have seeu iu uo other whiteflsh. 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 baud of salmon-reddish the entire length 

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

 species. 



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

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

 bue Sound to the Kuskoquim Kiver, 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 iu Juue, 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 

 flue lot of these fish, taken from a flsh-trap on the Lower Auvik 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 au extremely delicate 

 shade, -which shows beautifully upon the silvery background. 



All of the scales on the dorsal surface are bordered vrith 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 bead silvery. Iu very bright 

 examples the fleshy color ou the fins becomes almost blood-red and shades ofl:" upon the surrounding 

 scales eveu from the dorsal fln. 



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

 SQeu at another angle it only reaches the lateral line. 



Thvmallus signifer (Rich.). Grayling {CJni-hdh-pau-f/'iik). 



29950. (253.) Nulato, Yukon Kiver, Marcli, 1881. Grayling. 

 32868, 32369, 32870, 32880. 



(Notes ou original Nos. 56 to 60.) 



Grayling. — Nulato and Andraevsky. Yukon Ei\'er aud tributaries. Nos. 56, 57, aud 58, Nu- 

 lato; 59 aud 00, 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 specimens nearly 

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

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

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



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

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

 meuce below the pectorals and extend to the veut, becomiug almost obsolete iu .some specimens 

 back of the ventrals. 



Extending along the median line of the abdomeu 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 fin at right angles 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 the membrane between the rays. The spots are brighter colored farther back ou the flu. 



