184 CONTEIDUilO^S TO NORTH AMERICAN ICHTHYOLOGY III. 



ior that of jarrovii. If I bad not been able to compare generosus with 

 jarrovii, I should never have suspected, their identity. 



Specimens in United States Nat'i07ial Museum. 



41. PANTOSTEUS PLEBEIUS {Baird & Girard) Jordan. 



Flain Suclcer. 



1854 — Catostomns plebeius Baird & Girard, Proc. Ac. Nat. Sc. Pbila. 28. 



Catostomus 2)Jehiu8 Agassiz, Am. Journ. Sc. Arts, 2d series, xix, 208, 1855. 



Minomus pleheius Gu^ard, Proc. Ac. Nat. Sc. Phila. 173, 1856. 



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



Catostomns plehejus GtJNTHER, Cat. Fishes Brit. Mus. vii, 15, 1868. 



Caiostomus 2>Jel)('jus Jordan & Copeland, Check List, 156, 1876. 



Paniosteus ])leheius J ORD\'ii, Bull. U. S. Nat. Mus. xi, p. — , 1878. 

 1872 — Minomus dcJjihinus Cope, Hayden's Geol. Surv. Wyoming, 1870, 435, 1872. 



Fantostens dcJphinus Cope & Yarrow, Lieut. Wheeler's Rejit. Expl. W. 100th 

 Sler. vol. 5, 673, 1876. 



Fantostens do^ilunns Jordan & Copeland, Check List, 156, 1876. (Misprint for 

 deJphinus.) 

 1872 — Minomns hardus Cope, Hayden's Geol. Surv. Wyoming, 1870, 436. 



Fantostens hardus Cope, Lieut. Wheeler's Expl. W. 100th Mer. vol. 5, p. 673, 1876. 



Fantostens hardus Jordan & Copeland, Check List, 156, 1876. 



Habitat. — Basin of the Colorado. Lake Guzmau. 



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 Fantostens delphinus and P. hardus I have been unable to examine. 

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

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

 draw Irom the printed descriptions of joZe&dws, del2)himis, ami bardns 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, 



