THE FISHES OF ALASKA. 235 



21. Coregonus nelsoni Bean. Nelson's WJritejish. 



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

 July 20, 1903. 



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

 (Townsend 1887), Point Barrow (Murdoch 1885). Nulato and Andreafski. Yukon River (Nelson 1887), 

 and Grantley Harbor (Scofield 1899). 



22. Argyrosomus pusillus i Beam. Least WMtefish. 



Six specimens, 9.75 to 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 4.67 in body; depth 5.5; eye 3.75 in head; dorsal 10: anal 12: ventral 1 1 : scales 10-90-8. 



Body rather elongate, compressed; mouth oblique, gape rather small, extending back about half 

 the length of the mamillaries; 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 mi< Idle of pupil, 2.3 in head ; teeth almost microscopic, in both jaws, none on tongue; gill- 

 rakers long, slender, and numerous, 104-2G 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 alter third and fourth, leaving the margin of the tin very slightly concave; insertion of dorsal 

 midway between tip of .snout and a point about halfwaj between adipose and caudal tins: caudal large, 

 equally forked, both lol.es 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 oi 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 minute black punctulations; sides below lateral line and a short distance above, 

 silvery, belly white; dorsal and caudal almost imperceptibly dusky; other tins 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 (18S9j as Curegonns jnisillus from Kuwuk (Kobuk) 

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

 lloihani Inlet, Kolzel.iie Sound. It has also been recorded by Bean I8S2 from St. Michael and 

 northern Alaska; by Nelson (1887) from Andreafski, Yukon River, and by Scofield i ISiliii from (Irani ley 

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



23. Argyrosomus laurett® (Bean). 



Originally described by Bean (1882) as Curegoniis laurettn- from Point Barrow and Port Clarence, 

 and recorded by him also from the Yukon River at Nulato. ( ither records are as follows: Yukon River 

 at Nulato (Nelson 1887); Meade and Kuaru rivers and Elson Bay (Murdoch 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. (PL xiv, fig. 1.) 



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

 any other place. 



