184 CONTRIBUTORS TO NORTH AMERICAN ICHTHYOLOGY III. 



for that of jarrovii. If I had not been able to compare generosus with 

 jarrovii, I should never have suspected their identity. 



Specimens in United States National Museum. 



41. PANTOSTEUS PLEBEIUS (Baird & Girard) Jordan. 

 Plain Sucker. 



1854 Catostomus plebeius BAIRD & GIRARD, Proc. Ac. Nat. Sc. Pbila. 28. 



Catostomus plebius AGASSIZ, Am. Journ. Sc. Arts, 2d series, xix, 208, 1855. 



Minomus plebeius GIRARD, Proc. Ac. Nat. Sc. Pbila. 173, 1856. 



Minomus plebeius GIRARD, U. S. Mex. Bound. Surv. Icbtb. 38, pi. xxii, f. 1-4, 1859. 



Catostomus pltbcjus GUNTHER, Cat. Fisbes Brit. Mus. vii, 15, 1868. 



Catostomus plebejus JORDAN & COPELAND, Cbeck List, 156, 1876. 



Pantosteus plebeius JORDAN, Bull. U. S. Nat. Mus. xi, p., 1878. 

 1872 Minomus delpliinus COPE, Hayden's Geol. Surv. Wyoming, 1870, 435, 1872. 



Pantosteus delphinus COPE & YARROW, Lieut. Wheeler's Rept. Expl. W. lOOtb 

 Mer. vol. 5, 673, 1876. 



Pantosteus dolpliinus JORDAN & COPELAND, Cbeck List, 156, 1876. (Misprint for 



delphinus.) 

 1872 Minomus bardus COPE, Haydeu's Geol. Surv. Wyoming, 1870, 436.' 



Pantosteus bardus COPE, Lieut. Wheeler's Expl. W. lOOtb Mer. vol. 5, p. 673, 1876. 



Pantosttus bardus JORDAN & COPELAND, Cbeck List, 156, 1876. 



HABITAT. Basin of the Colorado. Lake Guzman. 



The types of Catostomus plebeius are not to be found, and no speci- 

 mens referable to the species are in the National Museum. The types 

 of Pantosteus delphinus and P. bardus I have been unable to examine. 

 The scale-formula and small dorsal fin of C. plebeius indicate that it is 

 a species of Pantosteus. Assuming that it is so, I find myself unable to 

 draw from the printed descriptions of plebeius, delpliinus, and bardus any 

 sort of specific characters. Until such characters are shown, the burden 

 of proof lies with the proposer of those species, and I shall consider them 

 as identical until they are proved to be distinct. In characters of mouth, 



