172 Bulletin 47, United States National Museum. 



tubercles; upper lip broad, extending well down on sides of mouth, its 

 tubercles in 3 or 4 rows; lower lip thin; more deeply incised than in P. 

 generosus, the lobes rounded ; the cartilaginous sheath well developed ; 

 caudal peduncle stout; scales small, much crowded forward; dorsal small, 

 its height 1 in head, a little more than base of fin ; pectorals long, as long 

 as head, reaching halfway to ventrals ; ventrals short, not to vent ; fon- 

 tanelle a very narrow slit, or quite obliterated in old individuals; air 

 bladder small, the posterior part very long and slender. Dark greenish, 

 finely speckled, males with an orange lateral band ; peritoneum very black. 

 L. about a foot. Clear streams of upper Missouri and Columbia river 

 basins, Black Hills, and northwestward. (Named for David Starr 

 Jordan.) 



Pantosteus jordani, EVERMANN, Bull. U. S. Fish Com., 1892 (Jan. 27, 1893), 51, with plate, 

 Whitewood Creek and other streams of the Black Hills, South Dakota; Red 

 Rock River, Red Rock, Montana, and numerous other localities. (Type, No. 43963.) 



Catostomus discobolus, EVERMANN, Bull. U. S. Fish Com., 1891 (1892), 41, plate 18, fig. 1. 



Pantosteus virescen*, JORDAN, Bull. 4, U. S. Nat. Mus., 1878, 780. 



PatUosteus columbianus*, EIGENMANN & EIGENMANN, American Naturalist, February *, 1893, 151, 

 Boise River, Caldwell, Idaho. (Types in Indiana University and British Museum.) 



Catostomus discobolus, JORDAN & GILBERT, Synopsis, 125, 1883 ; not of COPE. 



277. PANTOSTEUS ARJEOPUS, (Jordan). 



Fins moderate ; dorsal higher than long, with 10, rarely 11, rays ; ven- 

 tral rays 10. Scales small, crowded forward, 10 or 9-70-8. Body elon- 

 gate, fusiform, subterete, the greatest depth 4 to 4 in length. Head 

 small, conical, 4 in length. Mouth quite large, with full, thick lips, 

 the upper very wide and pendant, with about 6 rows of very strong 

 papillae ; lower lip two-lobed, similarly papillose. Interorbital space 

 wide, convex; eye elevated, posterior, quite small. Color dark; scales 

 with dark punctulations. Kern River, California ; Carson River and 

 Reese River, Nevada, (apatof, slender; UTTTJ, aperture.) 



Catostomus arseopus, JORDAN, Bull. U. S. Nat. Mus., xn, 1878, 173, Kern River, California. 

 (Type, No. 31228.) 



Catostomus arseopus, JORDAN & HENSHAW, Kept. Chief Engin., App. nn., 1878, 188; JORDAN & GIL- 

 BERT, Synopsis, 127, 1883 ; GILBERT, Death Valley Expedition, 228, 1893. 



278. PANTOSTEUS CLARKI, (Baird & Girard). 



Closely related to P. arwopus, with restricted fontanelle and cartilagi- 

 nous sheath to jaws, but with the scales less crowded anteriorly, there 

 being but 23 before dorsal. D. 11. Scales 70; fins all small. Rio Gila 

 and tributaries in Arizona. (Named for John H. Clark, who first col- 

 lected it.) 



Catostomus clarlci, BAIRD & GIRARD, Proc. Ac. Nat. Sci. Phila., 1854, 27, Rio Santa Cruz, 

 Gila Basm, Arizona ; JORDAN & GILBERT, Synopsis, 130, 1883. (Type.JNo. 166.) . 



* Head 4f to 4. D. 11 or 12 ; A. 8. Scales 16 to 1 9-80 to 100-15. Eye H to 2 in snout, 1J to 

 If in interorbital, 3$ to 4 in head. All the fins pointed, the caudal lobes considerably longer 

 than the head. Light brown with indistinct clouds of darker. Three specimens, 92 to 100 mm. 

 in length. Boise River, Idaho, a tributary of the Columbia. Related to P. generosns, the eye 

 larger, the caudal longer. (Eigenmann.) (Named for the Columbia River.) An examination 

 of numerous specimens from the Columbia basin shows this to be the young of P.jordani. 



