31. CYPRINID.E SQUALIUS. 241 



396. S. squamatus (Gill) J. & G. 



Body very robust, subovate, compressed. Head large and long, 

 couical. Moutli ratlier large, oblique, terminal, the maxillary reaching 

 front of orbit, the upper lip on the level of the lower part of the eye. 

 Eye moderate, anterior, 5f in head. Dorsal fin small, inserted poste- 

 riorly, but directly over the veutrals. Scales moderate, suborbicular, 

 widely exposed. Color dark or blackish; "the scales all margined with 

 black; fins dusky. Head 3; depths. D. 8; A. 8; scales 10-53-6; 

 teeth 2, 5-4, 2. L. 8 inches. Salt Lake Basin. 



(Tigoma squamata Gill, Proc. Bost. Soc. Nat. Hist. 1861, and Ichth. Capt. Simpson's 

 Ex pi. 1876, 405.) 







397. S. atrarillS (Grd.) Jor. & Gilb. Utah Mullet; Chub of Utah Lake. 



Body rather stout, the caudal peduncle not slender. Head moderate, 

 subcouical. Mouth anterior, quite small, the maxillary not reaching to 

 the eye. Eye small, 5 in head. Fins quite small. Dorsal fin nearly 

 or quite over the ventrals. Scales large, not much imbricated, 25 be- 

 fore dorsal. Lateral line decurved. Olivaceous, blackish above, the 

 color formed of small black points. Head 4; depths*-. D. 9; A. 8; 

 scales 11-57-6; teeth 2, 5-4, 2, usually with evident grinding surface, 

 although placed by Girard and Cope in Siboma, which wants such sur- 

 face. L. 20 inches. Utah Basin. Very common in Utah Lake. A large 

 species, used as food, and very destructive to young trout. 



(Siboma atraria Grd. Proc. Acad. Nat. Sci. Phila. 1856, 208, and U. S. Pac. R. K. 

 Surv. x, '297: Siboma atraria and var. Ion-gimps Cope, ZooL Wheeler's Expl. W. 100th 

 Mer. v, 667.) 



39. S. crassus (Grd.) Jor. & Gilb. 



Body robust. Head rather small, the snout short and depressed. 

 Mouth moderate, oblique, the maxillary not reaching to the eye. Eye 

 small, 6 in head. Dorsal fin inserted slightly behind veutrals. Scales 

 moderate, broadly exposed. Dusky above, sides and below paler. Head 

 4; depth 3%. D. 8; A. 8; scales 10-57-7; teeth 2, 5-4, 2, with narrow 

 grinding surface. L. 10 inches. Sacramento River, California. 



(Tigoma crassa Grd. Proc. Acad. Nat, Sci. Phila. 1856, 207, and U. S. Pac. R. R. Surv. 

 x, 293.) 



cc. Slender species, the depth 4-4^ in length; lateral line 60-70. (Cheonda*,GTd.) 



399. S. coeruHcus (Grd.) Jor. & Gill). 



Body slender, subfusiform. Head slender, the snout long, conical, 



* Ch-conda Girard, Proc, Acad. Nat. Sci. Phila. 1856, 207: type Cheonda cooperi Grd. 

 ( A coined name.) 



Bull. Nat. Mas. No. 16 16 



