PLECTOSPONDYLI CYPBINIDAE C. DISCOBOLUS. 677 



CATOSTOMUS ALTICOLUS, Cope. 



Catostomus alticolus, COPE, Proc. Am. Phil. Soc. Phila., 1874, 138. Id., Rep. Plagop. 

 & Ichtby. Utah, 1874, 12. 



A stout, rather short species of sucker, with elongate head and nar- 

 rowed muzzle. The scales are larger behind than anteriorly, a,nd number 

 sixty transverse and nineteen longitudinal rows. The radial formula is : D. 

 10 ; C. 18 ; A. 7 ; V. 10, originating below the middle of the dorsal fin, and 

 neither extending to the vent nor reached by the pectoral fin ; caudal with 

 shallow emargination. The depth enters the length with caudal five times, 

 which is three and two-thirds the length of the head. Orbit 4.33 times in 

 head, 1.66 times in interorbital width. The muzzle is long (1.66 times 

 orbit), but is not produced much beyond the mouth, but is truncate and 

 narrowed viewed from above. Lip folds well developed ; the superior 

 pendant ; the inferior full but incised to the symphysis ; the surfaces 

 tubercular. Vertex flat. 



Total length, O m .0863 ; length to origin of caudal fin, O m .070 ; to origin 

 of anal, O m .0546 ; to origin of dorsal, O m .0365 ; width of head at posterior 

 nares, O m .008 ; at middle of pterotics, O m .010. Color silvery ; upper part of 

 sides and back dusky. In specimens of this size, the lateral line is invisi- 

 ble ; but in adults of eight inches obtained by Mr. J. S. Lippincott, it 

 extends to the basis of the caudal fin. 



Numerous specimens from Twin Lake, Colorado, obtained by Dr. J. 

 T. Rothrock, botanist of the survey. This lake is situated in the South 

 Park, at an elevation of 9,500 feet above the sea. 



CATOSTOMUS DISCOBOLUS, Cope. 



Catostomus discobolus, COPE, U. S. Geol. Surv. Wyoming & Contiguous Territories, 

 1870, 435. Id., Proc. Am. Phil. Soc. Phila., 1874, 138. Id., Eep. Plagop. & 

 Ichthy. Utah, 1874, 12. 



Numerous specimens from the Zuni River, New Mexico, and from 

 another locality in Arizona, obtained by H. W. Henshaw and Dr. C. Gr. New- 

 berry. 



