30. CATOSTOMID^E CATOSTOMUS. 129 



longer than the last rays ; pectorals and ventrals short ; caudal short ; 

 anal long. Pharyngeal bones rather weak, with smallish teeth. Black- 

 ish above ; males with the sides rosy ; fins dark. Head 3- ; depth 4. 

 D. 33; A. 7; scales 9-G5-9. L. 18 inches. Utah Lake. 

 (Jordan & Gilbert, Proc. U. S. Nat. Mas. iii, 464, 1880.) 



11O. C. fccniHlus Cope & Yarrow. Ulah Lake SueJcer. 



Body moderately stout, little compressed, the tail slender. Head sub- 

 conic, the profile regularly dectirved from the nape to the base of the 

 prem axillary spines, which abruptly protrude, forming a distinct "nose" 

 as in Chasmistcs Horns ; premaxillaries in front scarcely below the pre- 

 orbital. Mandible large, oblique, placed at an angle of 30 when the 

 mouth is closed, its length 3 in head. Upper lip full, pendent, with 

 about 4 rows of coarse papillae ; lower lip moderate, divided by a broad 

 notch, each lobe with about 6 rows of papillae. Eye a little behind 

 middle of head. First ray of dorsal twice height of the last, its length 

 greater than that of the base of the fin ; caudal forked, the lower lobe 

 longest; pectorals long; anal high. Dusky above, pale below. Head 

 4 ; depth 4^. D. 11 ; A. 7 ; V. 9 ; scales 8-GO-8. L. 13 inches. Utah 

 Lake ; excessively abundant. This species has evident affinities with 

 Chasmistes. 



(Cope & Yarrow, Zool. Wheeler's Expl. W. 100th Mer. v, C78, 1870 ; Jordan & Gil- 

 bert, Proc. U. S. Nat. Mus. 1880, 403.) 



cc. Upper lip comparatively thin, with but few (2 or 3) rows of papilLe. 

 /. Scales ranch reduced, and crowded anteriorly ; dorsal rays 11-15. 



141. C. cypfllO Lockington. 



A conspicuous hump behind the occiput, supported by a greatly ex- 

 panded, broadly triangular interneural bone. Upper lip with about 3 

 rows of papillae, lower lip with about 8 ; the lower lip divided to the 

 base by a broad emargination. D. 15 ; A. 8 ; V. 10 ; Lat. 1. 72. Colo- 

 rado Eiver at mouth of Gila. (LocJciingfon.) 



(Lockington, Proc. Acad. Nat. Sci. Phila. 1880.) 



142. C. coillliaersOBii (Lac^pede) Jordan. Common Sucker ; White Sucker ; Brook 



Sucker; Fine-scaled Sucker. 



Body moderately stout, varying with age, subterete, heavy at the 

 shoulders, the depth 4-4| in length. Head rather large and stout, 

 conical, flattish above, its length 4-44 in body (3^-4^ in young). 

 Snout moderately prominent, scarcely overpassing the mouth. Mouth 

 rather large ; the lips strongly papillose, the upper moderate, with 2 or 3 

 rows of papillae. Scales crowded anteriorly, much larger on the sides 

 than below j scales 10-04 to 70-9. Coloration olivaceous ; males in 

 Bull. Nat. Mus. No. 1C 9 



