130 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV 



spring with a faiut rosy lateral band ; yonng brownish, more or less 



mottled, often with confluent blackish lateral blotches or a lateral band. 



Lateral line visually imperfect in the young. L. 18 inches. All streams 



from Labrador to Montana, and southward to Florida. The commonest 



of the suckers. 



{Cypr'uius commersoni Lac6p6ilc, Hist. Nat. Poiss. v, 502, 1803: Cyprinus feres Mitchill, 

 Trans. Lit. & Phil. Soc. N. Y. 1814, 458 : Catostomus teres Giiuther, vii, 15 : Catostomus 

 teres Jordan, 1. c. 166 : Catostomus communis and bostoniensis Le Suenr, Jouru. Acad. 

 Nat. Sci. Pliila. 1817, 95, 108, etc.) 



ff. Scales scarcely' reduced or crowded anteriorly ; dorsal rays 10 or 11. 



113. C EfiBSiS'iaas Baird & Girard. 



Body rather elongate, subterete, heavy at the shoulders, tapering 

 backward, the dei)th about 5 in length. Head moderate, about 4J in 

 length. Mouth comparatively small. Lips moderate, the upper nar- 

 row, with about 2 rows of large tubercles. Scales subequal, 58-G3 in 

 the lateral line, 19 in a cross-series. A series of dusky spots along each 

 row of scales, the spots often obscure.'* Gila Basin. 



(Baird & Girard, Proc. Acad. Nat. Sci. Pliila. 1S54, 28 ; Cope & Yarrow, Zool. Wheel- 

 er's Expl. W. 100th Mer. v, G7G, 187G; Jordan, 1. c. Ifi5.) 



11 't. C. clarBci Baird & Girard. 



Body moderately stout, depth 4| in length. Head very small and 

 short, about 5 in length. Eye moderate. Fins all notably small. 

 Scales small, subequal, 9-70-9 ; larger mesially than posteriorly. Body 

 with scattered nebulous spots. {Girard.) Arizona. 



(Baird & Girard, Proc. Acad. Nat. Sci. Phila. 1854, 27.) 



*** Scales moderate, not crowded anteriorly, 48-55 in the lateral line ; head peculiarly 

 formed. {Hypentelium Rafinesque.*) 



115. C MigVDcaBiS Le Sueur. — Rorj SncVer; Stone Roller; Totcr ; Crawl-a-'bottom ; 

 Jlammcr head; Stone Lug(jer ; Hoy Molly. 



Head flattened above, transversely concave between the orbits, the 

 frontal bone thick, broad, and short, the physiognomy being therefore 

 peculiar. Ventral rays normally 9. LTpper lip very thick, strongly 

 papillose, with a broad, free margin, which has upwards of 8-10 series of 

 papillae upon it ; lower lip greatly developed, strongly papillose, con- 

 siderably incised behind, but less so than in Catostomus proper. Fon- 

 tanelle shorter and smaller than in C. commersoni. Pectoral fins un- 

 usually large. D. 10 or 11 ; Lat. 1. 48-55 ; 12-15 scales in a cross- 



*Rafinesque, Journ. Aciid. Nat. Sci. Phila. 1818, 421: type Exoglossnm macroiHeruiu 

 Raf. = Catostomus viyricans Le Sueur. (iKh, below; TrtiT?/, five ; labium, lip, the five- 

 lobed Jowcr lip being supposed to distinguish it from Exocjloasum. ) (^ Uylomyzon Ag. ) 



