242 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



rather flattened above. Jaws equal, the maxillary reaching to orbit. 

 Dorsal fin inserted behind ventrals. Anal fin quite small. Scales 

 rather small. Dusky bluish above, pale below ; scales everywhere with 

 fine puuctulations. Head 3|; depth 4^. D. 9; A. 7; scales 13-G1-7; 

 teeth 2, 5-5, 2, with narrow grinding surface. Lost Kiver, Oregon. 



(Clteonda ccerulea Grd. Proc. Acad. Nat. Sci. Phila. 1850, 207, aud U. S. Pac. R. R. 

 Snrv. Fish. 295.) 



400. S. coo|)ej-i (Grd.) Jor. «fe Gilb. 



Body elongate, subfusiform. Head moderate, the snout thickish, 

 subconical, slightly projecting. Mouth oblique, the maxillary not quite 

 reaching to the eye. Eye large, 4^ in head. Fins large, the anal no- 

 tably so. Dorsal somewhat behind ventrals. Coloration plain, rather 

 pale. Head 4^; depth 4|. D. 8; A. 10; Lat. 1. 63. Columbia Eiver. 



(Cheonda cooperi Grd. Proc. Acad. Nat. Sci. Pliila. 1856, 207, and U. S. Pac. R. R. 

 Snrv. Fish. 294: Leuciscus cooperi Giiuther, vii, 243.) 



401. S. nigrescens (Grd.) Jor. & Gilb. 



Body rather elongate, subfusiform. Head long and rather pointed. 

 Caudal peduncle long. Mouth terminal, oblique, the maxillary scarcely 

 reaching to eye. Snout prickly in male specimens. Fins moderate, the 

 dorsal slightly behind ventrals. Color very dark, the sides with black 

 spots, the scales with fine puuctulations. Head 3h; depth 4. D. 8; 

 A. 7; scales 16-70-10; teeth 2, 4 (-5,2?). Boca Grande and Janos 

 Eiver. 



(Tigoma vigrcacens Grd. Proc. Acad. Nat. Sci. Phila. 1856, 207, and U. S. Mex. Bound. 

 Surv. Ichth. 64.) 



402. S. iiiodestus (Garm.) J. & G. 



Brownish, paler below; flanks not lustrous as in 8. nigrescens. Form 

 moderately stout, the outlines regular. Dorsal behind ventrals, its free 

 border convex. Anal truncate. Distinguished from S. nigrescens by 

 tbe greater length and the shape of the head, and a diflerence in the 

 position of the dorsal. Head 3^ ; depth 3.f . D. 8 ; A. 8 ; scales 14-65-9. 

 Saltillo, Coahuila. 



(Cheonda modesta Garman, Bull. Mus. Comp. Zool. viii, 92, 1881.) 

 103.— PIIOXIRfUS Agassiz. 



Minnows. 



(Agassiz, M^m. Soc. Nat. Hist. Neufchatel, i, 37, 1837: type Cyprimts phoximis L.= 

 Phoxwus l(vvis Ag. ; the common "Minnow" of Europe.) 



Body stout. Mouth normal, without barbel. Teeth 2, 5-5, 2, or 2, 

 5-4, 2, hooked, without grinding surface. Scales usually small, little 



