PANTOSTEUS JORDANI. 
55 
PANTOSTEUS GENEROSUS (Grd.). 
Catostomus ( Acomus ) generosus Grd., Proc. Acad. Nat. Sci. Phila. 1856, 174 (Cottonwood Creek, Utah). 
Acomus generosus Grd., P. R. R. Survey, 1858, 221 (Cottonwood Creek, Utah). 
Catostomus f generosus, Cope, Plagopterinae andlchthyol. of Utah, 1874, 7 (Provo, Utah); ibid., Jordan 
and Copeland, Check List, 1876, 156. 
Pantosteus generosus, Jordan, Bull, xn, U. S. Nat. Mus., 1878, 183 (Great Basin of Utah) ; ibid., Jordan 
and Gilbert, Synopsis, 1883, 123 (only in part) ; ibid. , Jordan, Cat. Fish. N. A., 1885, 17 ; ibid., 
Bull, ix, U. S. Fish Com. for 1889 (1891), 31 and 35 (Jordan River, Sevier River, and Utah Lake). 
Minomus platyrhynohus Cope, Proc. Am. Philo. Soc. Phila. 1874, 134 (Provo, Utah); ibid., Plagopterinae 
andlchthyol. of Utah, 1874, 6 (Provo, Utah). 
Pantosteus platyrhynohus, Cope & Yarrow, Zool. Wheeler Survey, 1875, 673, pi. xxix, figs. 3 and 3 a 
(Provo River, Utah); ibid., Jordan & Copeland, Check List, 156, 1876; ibid., Bull, xn, U. S. 
Nat. Mus., 1878, 183 (Utah Lake and tributaries); ibid., Jordan & Gilbert, Synopsis, 1883, 
123 (Utah Lake). 
Minomus jarrovii Cope, Proc. Am. Phil. Soc. Phila. 1874, v, 129-139 (Provo, Utah). 
Pantosteus jarrovii, Jordan & Copeland, Check List, 1876, 156. 
Catostomus guzmaniense, Cope & Yarrow, Zool. Wheeler Survey, 1875, 679 (Utah Lake). 
Habitat : Great Salt Lake Basin. 
PANTOSTEUS DISCOBOLUS (Cope). 
Catostomus discobolus Cope, Hayden’s Geol. Survey of Wyo., 1870, 435 (two specimens, one certainly, 
the other probably, from Green River, Wyoming). 
Minomus delphinus Cope, Hayden’s Geol. Survey of Wyo., 1870, 435 (probably from Green River). 
Pantosteus dolphinus, Jordan & Copeland, Check List, 1876, 156 (misprint for delphinus). 
Pantosteus delphinus, Jordan & Gilbert, Synopsis, 1883, 122 (probably from Green River) ; ibid., Jordan, 
Bull, ix, U. S. Fish Comm, for 1889 (1891), 27 (Eagle River, Gypsum, Colo. ; Gunnison and 
Uneompahgre rivers, Delta, Colo.; Rio de las Animas and Rio Florida, Durango, Colo.). 
f Minomus bardus Cope, Hayden’s Geol. Survey of Wyo., 1870, 436 (probably Green River). 
Pantosteus jarrovii, Cope & Yarrow, Zool. Wheeler Survey, 1875, 674, in part only (Zuni River, N. M., and 
Tierra Amarilla, N. M. The figures, pi. xxix, 2 and 2a, are P. plebeius). 
Catostomus discobolus Cope, Proc. Am. Philo. Soc. Phila. 1874, 138; ibid., Plagopterinae and Ichthyol. of 
Utah, 1874, 10 (“Zuni River, Arizona;” “Arizona”) ; ibid., Cope & Yarrow, Zool. Wheeler 
Survey, 1875, 677 (Zuni River, N. M. ; “ Arizona”). 
Habitat: Basin of the Colorado River. 
Tn the appended table is given a list of all the specimens of Pantosteus that can 
now be found in the U. S. National Museum, together with my identification of each. 
Al l the specimens which have been called P. jarrovii that I have been able to find 
are apparently from the Rio Grande and Utah basins, those from the former being P. 
plebeius and those from the latter P. generosus. 
Those reported by Cope and Yarrow from the Zuni river, New Mexico, can not be 
found, but were most likely P. discobolus , which is known to occur there. 
There are seven bottles of suckers in the Museum, labeled Catostomus discobolus. 
Three of these lots are from the Colorado Basin and are almost certainly young spec- 
imens of P. discobolus. They have been regarded by Dr. Jordan as the young of 
Catostomus latipinnis ; but I find, upon comparing them with small specimens of lati- 
pinnis from the Uneompahgre and Sevier rivers, that the fontanelle is more nearly 
obliterated, the lower lip is broader and less deeply incised, and the cartilaginous 
sheath much more developed than in latipinnis. Furthermore, they are not distin- 
guishable by me from specimens of what has been called P. delphinus of the same size 
