394 REPORT OF COMMISSIONER OP FISH AND FISHERIES. 



from Mitchell, Bazilo Mills, Niobrara, Chamberlain, Long Pine, and Cler- 

 mont, have the scales decidedly crowded and irregular on the anterior part 

 of the body; this is especially so in the two large specimens from Clermont. 

 Those from Chadron, Custer, Hill City, Redwater Creek, Douglas, and New- 

 castle are not much crowded, but they are irregular in arrangement. 



Five of the eight small specimens from Glenrock are peculiar in that there 

 is no trace of the lateral line. In the three others the lateral line is normally 

 developed. The number of rows of papillae upon the upper lip varies from 

 2 to 5, the usual number being 3 or 4. These differences do not possess any 

 geographic significance; specimens from the same stream or from the same 

 sub-basin show both extremes of variation in this regard. Nor have we been 

 able to discover that these variations in lip characters are coordinated with 

 any other characters. Upon comparing these Missouri specimens with others 

 from Ohio and Pennsylvania, it appears that in the western specimens the 

 scales average somewhat larger and the papilla? on the upper lip are arranged 

 in more rows. The eye is somewhat smaller in the western specimens. The 

 two forms may be diagnosed as follows: 



a. Scales small, 60 to 70 in lateral line, much crowded anteriorly ; eye less than 



5 in head ; upper lip with 2 or 3 rows of papillae commersonii. 



aa. Scales large, 54 to 64 in lateral line, less crowded anteriorly; eye smaller, 

 usually more than 5 in head; upper lip with 3 or 4 rows of papil- 

 la; sucklii. 



We doubt, however, if sucklii should be recognized even as a subspecies, and 

 for the present we combine the two. 



In nearly all the young western specimens the dark spot at base of caudal 

 fin is quite distinct; there is often a similar dark spot above the ventral and 

 one just above the middle of the pectoral. All these disappear with age. 



30. Catostomus nigricans Le Sueur. Hog Sucker; Stone-lugger. Kansas River 



(Graham, 1885); Osage River (Cragin, 1885a); Little Piney River, Osage 

 Fork, Lock Fork, and Jones Creek, Mo. ; Marais, Niangua, and Sac rivers, at 

 Dixon, Marshfield, and Springfield, Mo. (Meek, 1891). This common eastern 

 species seems not to occur in Nebraska, South Dakota, or Wyoming, but 

 reaches its western limit in the lower Missouri Basin. 



31. Erimyzon sucetta oblongus (Mitchill). Chub Sucker. Professor Snow reports 



this fish from the Kansas River at Lawrence (Cragin, 1885«). 



32. Minytrema melanops (Rafinesque). Spotted Sucker; Striped Sucker. Missouri 



River at Fort Pierre and Yellowstone River (as Ptychostomus haydeni type, 

 Girard, 1856 and 1858); Osage River and Mill Creek (Cragin, 1885a). The 

 fact that this species has not been taken west of Missouri by any recent col- 

 lector makes its occurrence in the upper Missouri region questionable. 



33. Moxostoma bucco (Cope). St. Joseph, Mo. (as Ptychostomus bucco type, Cope, 



1871). Only the type known ; a doubtful species. 



34. Moxostoma aureolum (Le Sueur). Common Bedhorse. Blackwater Creek at 



Brownsville, Saline County, Mo. ; Flat Creek, Sedalia, Mo. (as Moxostoma 

 macrolepidotum duquesnei, Jordan & Meek, 1885) ; plentiful in Kansas (Gra- 

 ham, 1885) ; Soldier and Shunganunga creeks, Silver Lake, Osage River, Blue 

 River, and Kansas River (Cragin, 1885a) ; La Mine River, Mo. (Jordan & 

 Meek, 1885); Shunganunga Creek, Topeka (as AT. macrolepidotum, Gilbert, 

 1885) ; Solomon River, Beloit, Kans. (Hay, 1887) ; Osage River, Marshfield, 

 Mo. ; Lock Fork, Mansfield, Mo. ; Big Piney River, Cabool, Mo, ; Little Piney 

 River, Newburg, and Arlington, Mo.; Gasconade River, Arlington, Mo.; 

 Marais River, Dixon, Mo. ; Niangua River, Marshfield (as M. macrolepidotum 

 duquesnei, Meek, 1891) ; Big Sioux River at Sioux Falls and Sioux City (Meek, 

 1892) ; Belle Fourche River, Belle Fourche, S. Dak. ; Redwater Creek, Belle 

 Fourche, S. Dak. ; and south fork of Cheyenne River, Cheyenne Falls, S. Dak. 



