130 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
spring with a faint rosy lateral band ; yonng brownish, more or less 
mottled, often with confluent blackish lateral blotches or a lateral band. 
Lateral line usually imperfect in the young. L. 18 inches. All streams 
from Labrador to Montana, and southward to Florida. The commonest 
of the suckers. 
{Cyprinus commersoni Lac^p&de, Hist. Nat. Poiss. v, .502, 1803: Cyprimis te?'esilitcliill, 
Trans. Lit. & Phil. Soc. N. Y. 1814, 453 : Caiostomus teres Giiutlicr, vii, 15 : Catostomiis 
teres Jordan, 1. c. IGS : Caiostomus communis and hostoniensis Le Suenr, Journ. Acad. 
Nat. Sci. Pliila. 1617, 95, 106, etc.) 
ff. Scales scarcely reduced or crowded anteriorly ; dorsal rays 10 or 11. 
143. C. BSissg'aaBS Baird & Girard. 
Body rather elongate, subterete, heavy at the shoulders, tapering 
backward, the depth about 5 in length. Head moderate, about in 
length. Mouth comparatively small. Lips moderate, the upper nar- 
row, with about 2 rows of large tubercles. Scales subequal, o8-G3 in 
the lateral line, 19 in a cross-series. A series of duskj^ spots along each 
row of scales, the spots often obscure. Gila Basin. 
(Baird & Girard, Proc. Acad. Nat. Sci. Phila. 1854, 28 ; Cope & Yarrow, Zool. Wheel- 
ePs Ex]d. W. lOOtli Mer. v, G76, 1876; Jordan, 1. c. 165.) 
114. C. clJirSii Baird & Girard. 
Body moderately stout, depth 4g 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 posteriorl 3 ^ Body 
with scattered nebulous spots. {Girard.) Arizona. 
(Baird & Girard, Proc. Acad. Nat. Sci. Phila. 1854, 27.) 
*** Scales moderate, not crowded anteriorly, 43-55 in the lateral line; head i)ecnliarly 
formed. {Ilypcntelium Rafinescpie.*) 
145. C. iiigrflca.Bis Le Snenr. ^og Suclier; Stone ItoJler; Totcr ; Craivl-a-hotiom ; 
Hammer head; Stone Lugger; Hog Molly. 
Head flattened above, transversely concave between the orbits, the 
frontal bone thick, broad, and short, the phjvsiognomy being therefore 
peculiar. Ventral rays normally 9. Upper lip very thick, strongly 
papillose, with a broad, free margin, which has upwards of 8-10 series of 
papilla) upon it ; lower lip greatly developed, strongly iiapillose, con- 
siderably incised behind, but less so than in Catosfomm proper. Fon- 
tanelle shorter and smaller than in C. commer.wni. Pectoral fins un- 
usually large. D. 10 or 11; Lat. 1. 48-55; 12-15 scales in a cross- 
* Rafinesqne, Jonrn. Ac id. Nat. Sci. Phila. 1818, 421: type Exoglossnm macropterum 
Raf. = Caiostomus nigricans Le Suenr. (Inh, below; n-evTij, live ; lahium, lip, the live- 
lobed lower lip being supposed to distinguish it from Exoglossum. ) (= Hylomyzon kg. ) 
