820 FISHES—CATOSTOMIDA. 
strongly papillose, with a broad free margin, on which are eight to ten series of papille ; 
lower lip greatly developed, strongly papillose, considerably incised behind, but less so 
than in the other species of this genus; pectoral fins very large; scales moderate, not 
crowded anteriorly, nearly equal over the body ; eye rather small, four and a half to five 
in head; color olivaceous; sides with brassy lustre; belly white; back brown, with 
several dark cross-blotches, irregularly arranged, obsolete in old individuals ; lower fins 
dull red with dnsky shading; head 4 to 4} in length; depth 44 t05; D., 11; V., 9; 
scales 7-505. Length, one to two feet. 
Habitat, New York to North Carolina, west to the Great Plains and Texas. 
Diagnosis.—This is the only Sucker having the eye sockets so elevated 
that the space between them on the top of the head is transversely con- 
cave. ° 
Habits —This fish is extremely abundant in every running stream in 
Ohio, where its singular, almost comical form is familiar to every school 
boy. It delights in rapids and shoals, preferring cold and clear water. Its 
powerful pectorals render it a swifter swimmer than any other of its 
family. Its habit is to rest motionless on the bottom, where its mottled 
colors render it difficult to distinguish from the stones among which it 
lies. When disturbed, its darts away very quickly, after the manner 
of the Etheostomoids. They often go in small schools. I have never 
found this fish in really muddy water, and when placed in the aquarium 
it is the first fish to die as the water becomes foul. Although called the 
Mud Sucker in the book, it is most characteristically a fish of the run- 
ning streams. This species reaches a length about two feet, and is often 
caught in its spawning season by means of a spear or snare. It is, like 
the preceding, a “ boy’s fish,” and not worth the eating. 
GENUS 20. ERIMYZON. Jordan. 
Moxostoma, AGAssiz, Journal Science and Arts, 1854, 200. (Not of Rafinesque.) 
Erimyzon, JORDAN, Bull. Buff. Soc. Nat. Hist., 1876, 95. 
Teretulus, COPE, Synopsis of Fishes of N. C., 2d ed., Addenda, 1877. (Not of Rafinesque.) 
Cyprinus, Catostomus, and Labeo, sp. EARLY AUTHORS. 
Type, Cyprinus oblongus, Mitchiil, Cyprinus sucetta, Lac. 
Etymology, eri, an intensive particle ; muzo, to suck. 
Head moderate, rather broad above ; mouth moderate, somewhat inferior, the upper lip 
well developed, freely protractile, the lower moderate, infolded, A-shaped in outline, pli- 
cate, with 12-20 plice on each side; lower jaw without cartilaginous sheath, rather stronger 
than usual, and oblique in position when the mouth is closed, the mouth thus similar to 
that of Ichthyobus; eye moderate, rather high up, placed about midway of the head; 
suborbital bones considerably developed, not very much narrower than the fleshy por- 
tion of the check below them, the posterior suborbital concavo-convex, about twice as 
long as deep, sometimes divided, the anterior somewhat deeper than long, sometimes 
divided into two, sometimes united with the preorbital bone, which is well developed 
