408 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



of Solomon River, Lenora, Kans. ; Saline River, Wakeeney, Kans. ; Smoky 

 Hill River, Wallace, Kans. (Hay, 1887) ; Sappa Creek, Oberlin, Kans. ; Logan, 

 Kans. ; Osage River, La Cygne, Kans. (Gilbert, 1889) ; Boyer River at Arion, 

 Iowa (Meek, 1892) ; Blue River at Crete (Meek, 1894). 



This does not appear to be an abundant fish in the Missouri Basin, but it 

 is rather widely distributed. It was found by us only in Crow Creek near 

 Chamberlain, S. Dak., and at Ravenna, Nebr. , in Mud Creek. Head 4 J ; depth 

 4|; eye4f; snout 2|; interorbital width 3&. D. I, 8; A. i, 7; scales 6-48-4, 

 about 17 before the dorsal. Largest example about .3 inches long. 



73. Phenacobius scopifer (Cope). Missouri River near St. Joseph, Mo. (as Sarci- 



dium scopifer type, Cope, 1871) ; Bear Creek, Boone County, Mo. (Call, 1887). 

 This species may not be distinct from the preceding. 



74. Rhinichthys cataractae dulcis (Cirard). Western Dace. Sweetwater River 



(as Argyreus dulcis type, Girard, 1856 and 1858) ; Kansas (as B. maxillosus 

 type, Cope, 1864a) ; Kansas River near Fort Riley (as B. maxillosus, Cope, 

 1865); Red Cloud Creek and Platte River (as B. maxillosus, Cope, 1871); 

 Battle Creek, S. Dak. (as B. maxillosus, Cope, 1879) ; northeastern "Wyoming 

 and Montana (as B. ocella type, Garman, 1881) ; Cheyenne, Wyo. (as B. dulcis, 

 Garman, 1881); Kansas (as B. maxillosus, Garman, 1881); South Platte 

 River at Denver and Hartsel Hot Springs, and Middle Boulder Creek, 

 Boulder, Colo. (Jordan, 1891); Gardiner River (Jordan, 1891a); Beaverhead 

 River at Dillon, Mont.; Red Rock River at Red Rock, Mont.; junction of 

 Firehole and Gibbon rivers (Evermann, 1892) ; Poplar River at Poplar and 

 Missouri River at Craig, Mont. (Eigenmann, 1894). 



This species has been described as new three times from the Missouri 

 Basin, as indicated above. The present collection contains about 500 

 specimens from 34 different localities, as follows: Creek at Verdigris; 

 Minnechaduza Creek, Valentine; Niobrara River, Marsland; Bone Creek 

 near Long Pine ; Long Pine Creek, Long Pine ; Middle Loup River, Dunning ; 

 White River at Chadron; Lone Tree Creek at Chadron; White River, 

 Crawford; Chadron Creek, Chadron; Cheyenne River, Cheyenne Falls; 

 Cheyenne River, Edgemont ; Cottonwood Creek, Edgemont ; Chicken Creek, 

 Gammon's Ranch; Spearfish Creek, Spearnsk; Redwater Creek, Beulah; 

 Cox Lake near Beulah ; Beaver Creek, Buffalo Gap ; Rapid Creek, Rapid City ; 

 Fall River, Hot Springs ; Whitewood Creek, Deadwood ; Crow Creek, Gam- 

 mon's Ranch; creek at Hill City; creek at Custer; Crow Creek, Chamber- 

 lain ; Choteau Creek, Springfield; Big Goose Creek, Sheridan ; Powder River, 

 Arvada; south fork of Tongue River, Sheridan; Platte River, Glenrock; 

 Garden Creek, Casper; Platte River, Casper; Deer Creek, Glenrock ; Beaver 

 Creek, Newcastle; overflow pond at Sheridan; Platte River, Douglas. 



The variations shown by this large amount of material are very great, but 

 the differences found among the individuals from one locality are often as 

 great as are found among specimens from different localities. In mature 

 individuals the origin of the dorsal is nearer base of caudal than tip of 

 snout; or in about half of the specimens examined it is about midway 

 between nostril and base of caudal, while in the others it is nearer nostril. 

 The length of the snout varies from 1£ to 2 times the diameter of the eye, and 

 the extent to Avhich it projects beyond the mouth is subject to variation. 

 The thickness of the lips, the size of the barbel, the angle made by the two 

 sides of the lower jaw, the number of scales, and the color are all subject to 

 considerable variation. The specimens from Cheyenne Falls and other alka- 

 line streams are very pale, while those from purer waters are usually dark. 

 In the warm water from Hot Springs at Hot Springs, S. Dak., this was the 

 only species found, it occurring there in great abundance. We examined 

 this stream at many different places and found this fish everywhere abun- 



