428 



rnocEEDrxa^ of the national mu$!EVM. 



vol.. xxxvt. 



near Eugene, has greatly diminished the day's catch, but the anglers at lOugene 

 and A-ieinlty are now fully alive to the situation, and propose to restock it. 

 It is a beautiful stream, even grand in some of its stretches, and all along 

 70 of its miles of flowing through a fine canyon, a sight to delight the eyes 

 of an angler. 



The specie.s is related to the Rocky Mountain vvhitefish, Goregonvs 

 wiWumisoni Girard, with which it. has been hitherto confounded. 

 From this species it differs mainly in the slender body, slenderer 

 caudal j^eduncle, produced and pig-like nose, and ospeciall}' in the 

 extremely high " banner-like " adipose fin, which in old and 3'oung 

 is far larger than in any other Salmonida?. The description of 

 Coregonus williamsoni given by Jordan and Everman " is drawn 

 mainly from the Chisel-mouth Jack. The fish wardens of Oregon 

 have thus far recognized but one species of whitefish in Oregon. The 

 essential characters of this species are those of the subgenus or genus 

 Prosoj)!in)i, but the long nose, and especially the verj^ large adipose 

 fin, separate it wudely from Coregonus quadrilateralh^ the type of 



COREIiOXUS OltEfJOXirS. 



Prosopium. In the size of the adi})ose fin, (^orcgonus vilUayiisoni 

 is intermediate between (jikkI nlatcnil'tH .'A\\([ oregonivs^ though much 

 nearer the former. The Kocky Mountain whitefish, Coregonus iriJ- 

 liamsonl Girard,'' is found on the Pacific slope of the Ivocky Moun- 

 tains in Idaho, Washington, INfontana, and British Columbia, between 

 the Rocky Mountains and the Sierra Nevadas. It is well figured l)y 

 Bean '" from a male specimen from the Little Spokane River. 



It is a smaller fish than the Chisel-mouth Jack, deeper in liody, 

 with snout not produced, and the adipose fin, though large and long, 

 very much smaller than in Coregonus oregonius. 



The figure of Coregonus williamsoni Girard,'' from the Des Chutes 

 River, represents the Rocky INIountain whitefish, and not the Chisel- 

 mouth Jack. The form of the body, the form of the head, the mod- 

 erate adipose fin and robust caudal peduncle all agree with the 



Tishes North and Middle America, I, ]). 4(tn. 



^rroc. Acad. Nat. Sci. riiilado]i)hia, '[RT^',, p. l.'Kl: Des Chutes 11. Oregon. 



'"Bull. TT. S. Fish Commission for l.Sf)4, ]). 204, pi. xxr. fig. 3. 



^U. S. Tacific R. R. Survey, l.sr>S, p. 320, pi. i.xvr. 



