FISHES OF THE MISSOURI RIVER BASIN. 



393 



Locality. 



Mitchell, S. Dak 



Do 



Do 



Do 



Ewing, Nebr 



Do 



Bazile Mills, Nebr... 

 Niobrara, Nobr 



Do 



Scotland, S. Dak 



Chamberlain, S. Dak. 



Creighton, Nebr 



Long Pine, Nebr 



Do 



Do 



Do 



Dunning, Nebr 



Grand Island, Nebr. . 



Chadron, Nebr 



Do 



Do.. 



Cheyenne Falls, S Dak 



Do 



Custer, S. Dak 



Do 



Do 



Dill City, S Dak 



Red water Creek, S. Dak 



Do 



Do 



Do 



Glenroek, Wvo 



Do 



Do 



Do 



Douglas, Wyo 



Newcastle, Wyo 



Do 



Do 



Marsland, Nebr 



Buffalo (Jap, S. Dak .... 



Do 



Arvada, Wyo 



Do......... 



Do 



( 'lcriuont, Wyo 



Do 



Do 



Sheridan, Wyo. 



Scales. 



10-64-8, crowded anteriorly 



10 -60-7, crowded anteriorly .... 

 10-59-7, crowded anteriorly 



9-60-8, somewhat crowded .... 



10-58-9 



10-62-8 



in i;l' 9, crowded anteriorly 



9-60-8, crowded anteriorly 

 10-62-8, crowded anteriorly — 



9-61-7, not much crowded 



9 -59-7, crowded anteriorly 

 10-60-8, crowded anteriorly .... 



10-63-7, crowded anteriorly 



10-62-9, not much crowded 



9-60-8, not much crowded 



10-60-8, not much crowded 



9-59-8 



9-62-7, scarcely reduced ante- 

 riorly. 



10-60-8, not much crowded 



10-63-9, not much crowded 



10-60-7 



9-56-7 



9-56-7 



11-63-9, somewhat crowded 



10-62-8 



10-64-9 



10-62-7, rather crowded 



9-611-7, not much crowded 



9-58-7, not ranch crowded 



10-62-7, not much crowded 



9-58-8, not much crowded 



58-19, no lateral line 



9-60-8 



10-61-8, somewhat crowded 



10-58-7 



9-61-7, somewhat crowded 



9-54-6, somewhat crowded 



9-54-6, somewhat crowded 



9-58-6, somewhat crowded 



10-61-9, not much crowded 



9-64-8 



9-59-8 



9-59-7, not much crowded 



9-58-8, crowded, butregular. . . 

 10-57-6, crowded, but regular. . . 

 11-61-9, much crowded and ir- 

 regular. 

 10-56-7, crowded and irregular. 

 10- 60-8, crowded, but regular. . . 



9-59-7, not much crowded 



or 3 

 or 3 

 3 

 3 

 4 

 3 

 3 

 4 

 3 

 3 



or 3 

 3 

 3 



4 

 4 or 5 

 4 or 5 



An inspection of this table shows that the variation in the length of head 

 is from 3lj to 4£, and in depth from 4 to 6; the usual length of head and depth 

 of body is about 4 and 5, respectively. These variations, however, are 

 not unusual, and need give us no trouble. The same may be said of the eye 

 and snout; these differences are no greater than can be accounted for as due 

 to differences in age. The range of the dorsal fin rays is through 5, i. e., 

 from 9 to 13, the usual number being 10 or 11. This is a larger range than 

 has hitherto been noticed in this species and is, of course, independent of age. 

 The variation in the scales is rather remarkable, the number in a transverse 

 series ranging from 15 to 20, and those in the course of the lateral line from 

 54 to 64, the most usual formula being 9 or 10-59 to 61-7 or 8. The scale 

 formula for Catoatomus commcrsonii has usually been given as 10-64 to 70-9. 

 In the original description of Catostomus suckJii the dorsal rays are given as 

 14 (including rudimentary ones), but (iirard does not give the number of 

 scales, merely remarking that "the scales are large and but little smaller 

 anteriorly than posteriorly." The two figures which he gives in the Pacific 

 Railroad report show the scales as L0-64-8 and 9-55-9, the latter being a 

 young specimen. The specimens in our collection which we have examined 



