30. CATOSTOMID^ PANTOSTEUS. 123 



this species it has, however, nothing' else in common. "Head wide, 

 muzzle 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 edge. Eye 5.25 times in 

 length of head, twice in iuterorbital width. Head 5 times to end of 

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

 fin nearer end of muzzle than end of caudal scales. Scales of body 

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

 latter originating beneath hinder border of dorsal, not quite reaching 

 vent. Pectorals well separated. Isthmus wide, narrower than in M. dcl- 

 pJtinus. Color blackish above; a broad olive band from upper part of 

 opercular border along upper half of caudal peduncle, and a broad black 

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

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

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

 This species and the two preceding are not well separated. 



(Minomus bardus Cope, Haydeu's Geol. Surv. Wyoru. Terr. 1872, 436.) 



aa. Scales very ranch reduced and crowded anteriorly ; upper lip fall, pendent ; car- 

 tilaginous sheaths on jaws well developed, the commissure transverse and 

 abruptly angulate at the corners of the mouth. 



126. P. plaftyrrSaynncSaaas Cope. 



Body extremely elongate, the depth 5i-7 in length. Head 4f 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, 

 probably red in life. Utah Lake. Perhaps identical with the next. 



(Minomus platyrhyndms Cope, Proc. Auier. Phil. Soc. Phila. 1874, 134; Jordan, 1. c. 

 183.) 



127. P. geiaeTOsras (Girard) Jordan. 



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

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

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

 upper with 2. Isthmus very broad. Head 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, with 

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

 son lateral band. Eio Grande to Mojave Desert and Great Basin of 

 Utah ; very abundant. 



(Catostomns fjenerosus Girard, Proc. Acad. Nat. Sci. Phila. 1856, 174: Minomus jarro- 

 vii Cope, Proc. Amer. Phil. Soc. Phila. 1874, 35; Jordan, 1. c. 183.) 

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



