JORDAN ON FISHES OF DAKOTA AND MONTANA. 



793 



tt. Dorsal fin moderate, of 11 or 12 developed rays, nearly as long as high in front ; 

 body elongate, not greatly compressed ; the belly in front of ventrals transversely 

 rounded, not cariuated ; eye very large, about 2| in head ; scales loosely imbri- 

 cated, 4-50-7 ; pectoral fins considerably shorter than head, not reaching nearly 

 to ventrals ; anal rays 27 ; head 4|^ in length ; depth about 4 selenops. 



Numerous specimens are iu the collection, obtained by Dr. Coues in 

 Quaking Ash Eiver, a tributary of the Upper Missouri, June 26, 1874. 



Family SALMONID^. 



[I obtained no Salmonidce from any of the Missouri or Milk River waters, but found 

 this family abounding in the lake and river headwaters of the Saskatchewan. The 

 St. Mary's, for instance, was full of the beautiful trout identified by Prof. Jordan as 

 S. clarki var. aurora, and in Chief Mountain Lake, at an elevation of about 4,000 feet, 

 the Great Mackinaw Trout, Cristivomer namaycush, was very plentiful. There being no 

 tackle in the party stout enough to handle these fellows with, the men used to catch 

 them with hooks made from the handles of camp-kettles, attached to a piece of tent- 

 rope and baited with salt pork ; usually pushing out on the lake on a raft, and haul- 

 ing in the game just as a fisherman would take cod. I think there are in these same 

 waters one or two other Salmonidce, besides the two Whitefish. — C] 



Genus COREGONUS Linn^us. 

 12.— CoREGONUS couESi Mlluer. 



Chief Mountain WMtefish. 



1874 — Coregonus couesi Milker, Rept. Com. Fish and Fisheries for 1872-73, 88. 

 Coregonus couesi Jordan & Copeland, Check List Fishes N. A. 145, 1876. 

 Coregonus couesi Jordan, Man. Vert. 2d ed. 276, 1878. 

 Prosopium couesi Milner, MSS. — Jordan, Man. Vert. 2d ed. 362, 1878. 

 Coregonus couesi Jordan, Bull. U. S. Geol. Surv. iv, 429, 1878. 



This interesting species was described by Mr. Milner from the speci- 

 men in the present collection. I have nothing new to add to his very 

 complete account. 



13. — Coregonus quadrilateralis Eichardson. 



Menomonee WMtefish. Shad-waiter. 



1823 — Coregonus quadrilateralis Richardson, Franklin's Journal, 714. 



Coregonus quadrilateralis Richardson, Fauna Bor.-Am. iii, 204, pi. 89, f. 1. 



Coregonus quadrilateralis Cuvier & Valenciennes, Hist. Nat. des Poiss. xsi, 512. 



Coregonus quadrilateralis DeKay, New York Fauna, Fishes, 249, 1842. 



Coregonus quadrilateralis Storer, Synopsis Fishes N. A. 453, 1846. 



Coregonus quadrilateralis Agassiz, Lake Superior, 351, 1850. 



Coregonus quadrilateralis Gunther, Cat. Fishes Brit. Mns. vi, 1867, 176. 



