30. CATOSTOMID.E — PAXTOSTEUS. 123 



this species it has, liowever, iiotliinj;- else in commou. "Head wide, 

 mn/.'/Ae not projecting beyond upper lip; latter not pendant, with 

 narrow, smooth commissure and 3 or 4 rows of tubercles. Lower 

 lip deeply incised, tubercular to near inner ed.ue. Eye 5.25 times in 

 h'lintli of head, twice in interorbital width. Head 5 times to end of 

 basal caudal scales. Form stout. Body cylindric anteriorly. Dorsal 

 fin nearer end of nnizzle than end of caudal scales. Scales of botly 

 subequal, in 30 longitudinal rows between dorsal and ventral fins, 

 latter originating beneath hinder border of dorsal, not quite reaching 

 A'ent. l*ectorals well separated. Isthmus wide, narrower than in AL del- 

 ])}ii lilts. Color blackisli above; a broad olive band from upper part of 

 opercular border along upper half of caudal i)eduncle, and a broad black 

 band below, narrowing to a line along the middle of the peduncle ; be- 

 low yellowish, a band of the same cutting off a blackisli area above the 

 axilla, as in the last species." (Cope.) Probably from Green Eiver. 

 This species and the two iirecediug are not well separated. 

 {Aliuomus hardiis Cope, Hayden's Geol. Surv. Wyoin. Terr. 1872, 4;)6.) 

 ««. Scales very iimcli reduced and crowded anteriorly ; upper lip fall, pciident ; car- 



liliigiiions sbeatlis on jaws well developc^d, the commissure transverse and 



abruptly angulate at the corners of the ujoutli. 



12C. P. pBatyrruiyiiBcEms Cope. 



Body extremely elongate, the depth 5.}-7 in length. Head 4:^ in 



length, short and wide, with depressed and expanded muzzle, which 



considerably overhangs the mouth. Isthmus very wide. Dorsal rays 



11; ventral rays 9; scales 15-80-12. Belly and lower fins yellowish, 



l)robably red in life. Utah Lake. Perhaps identical with the next. 



(Minomus platyrkyncluis Cope, Proc. Amer. Phil. Soc. Pliila. 1874, 131; Jordan, 1. c. 

 183.) 



lay. p. jjC23eroSM§ (Girard) Jordan. 



Body moderately elongate, the depth 4^-5 in the lengtli. Head 

 rather short, 4§ in length, not specially broadened; muzzle not greatly 

 overhanging the mouth. Lower lip full, with 4 or 5 rows of tabercles ; 

 upj)er with 2. Isthmus very broad. Ilead with conspicuous mucous 

 tubes. Lower fins large. Dorsal rays 9 (rarely 10); ventral rays 10 

 (rarely 9); scales 11 to 14-83 to 87-13 to 15. Light brown above, witli 

 dusky spots and clouds ; males with the chin and fins red, and a crim- 

 son lateral band. Ilio Grande to IMojave Desert and Great Basin of 

 Utah ; very abmidant. 



{CatosiomiiH ficncrosna Ch-AvOi, Proc. Acad. Nat. Sci. Phila. 185G, 174: Minomus jurro- 

 ru Cope, Proc. Aniei-. Phil. iSoc. Phila. 1874, 35; Jordan, 1. c. 183.) 

 ** Scales very small, 100-105 in the lateral line. 



