THE FISHES OF ALASKA. 235 



21. Coregonus nelsoni Bean. Nelson's Whitejish. 



We have a single specimen, no. 2927, 12 inches long, collected in Lake Bennett, British Cohimbia, 

 July 20, 1903. 



Originally described liy Bean (1884) from Nulato, and since recorded from Middle Kobuk River 

 (Townsend 1887), Point BaiTow (Murdoch 1885), Nulato and Andreafski. Yukon River (Xelson 1887), 

 and Grantley Harbor (Scofiold 1S99'>. 



22. Argyrosomus pusillus (Bean). Least Whitejish. 



Six specimens, 9.75 lo 10.5 inches long, obtained at Caribou Crossing, and 8 specimens, 4.5 to 10 

 inches long, seined in Lake Bennett. The 4.5-inch Lake Bennett specimen is described as follows: 



Head 4.C7 in body; depth 5.5; eye 3.75 in head; dorsal 10; anal 12; ventraril; scales 10-90-8. 



Body rather elongate, compressed; mouth oblique, gape rather small, extending Ijack aljout half 

 the length of the maxUlaries; lower jaw considerably projecting; maxillary broad, somewhat curved, 

 not extending much beyond the anterior margin of orbit, its length 3.13 in Head; mandible long, reach- 

 ing to below middle of pupil, 2.3 in head; teeth almost microscopic, in both jaws, none on tongue; gill- 

 rakers long, slender, and numerous, 10+26 and 13+28; dorsal high, its longest ray (about the third) 

 about 1.3 in head and about twice length of base; base of dorsal 2.5 in head; dorsal rays shortening 

 rapidly after third and fourth, leaving the margin of the fin very slightly concave; insertion of dorsal 

 midway between tip of snout and a point about half way between adipose and caudal fins; caudal large, 

 equally forked, both lobes and indentation acutish; anal low, its longest ray 2.25 in head, its base 2 in 

 head, its posterior margin slightly concave; ventrals inserted somewhat behind origin of dorsal, reach- 

 ing about two-thirds distance to origin of anal, the length of their longest rays about 1.3 in head: pectoral 

 equaling ventral. 



Bluish above, with mmute lilack punctulations; sides below lateral line and a short distance above, 

 silvery, belly white; dorsal and caudal almost imperceptibly dusky; other fins wholly plain; iris sil- 

 very, a narrow blackish ring about the orbit, plainest above and below. 



This little fresh-water herring is probably not so abundant ia the Yukon basin as the two preceding 

 species. 



The species was originally described by Bean (1889) as Coregorms ■pxmllvs from Kuwuk (Kobuk) 

 River. He had previously recorded it in Cruise of the Corwin (1889) as Coregonus inerckii var., from 

 Hotham Inlet, Kotzebue Sound. It has also been recorded by Bean (1882) from St. ilichael and 

 northern Alaska; by Nelson (1887) from Andreafski, Yukon River, and by Scofield (1899) from Grantley 

 Harbor and Barter Island near the mouth of the Mackenzie River. 



23. Argyrosomus laurettse (Bean). 



Originally described by Bean (1882) as Coregonus laurettx from Point Barrow and Port Clarence, 

 and recorded hy him also from the Yukon River at Xidato. Other records arc as follows: Yukon River 

 at Nulato (Nelson 1887); Meade and Kuaru rivers and Elson Bay (Mtirdoch 1885): and Nushagak and 

 Naknek rivers (Gilbert 1895). 



24. Argyrosomus lucidus (Richardson). 



The only record for this species is Hershel Island (Scofield 1899). 



25. Argyrosomus alascanus Scofield. (PI. xiv, fig. 1.) 



Originally described from Point Hope aud Grantley Harbor (Scofield 1899); not yet known from 

 any other place. 



