Sy) FISHES—CATOSTOMIDA. 
described, interrupted in the adult, but with perfect tubes, imperfect in partly grown 
specimens, entirely obsolete in the young; scales in a longitudinal series 44 to47 in 
number, 12 to 14 in a transverse series from dorsal to ventrals; dorsal fin rather short 
and high, with about 12 developed rays, beginning rather nearer the snout than the 
base cf the caudal; pectoral fins mcderate, not reaching ventrals, the latter not to vent; 
ventrals rather in advance of the middle of the dorsal, their rays normally 9, rarely 8 or 
10; anal fin high and short, often more or less emarginate in males; caudal fin moder- 
ately forked, the lobes about equal; air-bladder with two chambers; males in spring 
with ths head covered with many small tubercles. 
But one species of this genus seems to be known. It is widely distributed in the 
waters of the Western and Southern States. 
This genus has been recently separated from Hrimyzon, on account of the peculiar- 
ities of the lateral line. The form of the body, the form of the mouth, and the charac- 
ter of the squamation differ considerably in the two genera. 
42. MINYTREMA MELANOPS (Rafinesque) Jordan. 
Striped Sucker; Sand Sucker; Spotted Sucker; Black= 
mosed Sucker. 
Catostomus melanops, RAFINESQUE, Ich. Oh., 1820, 57.—KIRTLAND, Boston Journ. Nat. Hist., 
v, 1245, 271 —SrorER, Synopsis, 1846, 424. 
Catostomus melanopsis, KIRTLAND, Zool. Ohio, 1¢38, 168, 
Ptychostomus melanops, AGASsi1z, Am. Journ. Sci. Arts, 2d series, xix, 1855, 204.—Copr, 
Proc. Am. Philos. Soc. Phila., 1870, 483. 
Erimyzon melanops, JORDAN, Bull. Buffalo Soc. Nat. Hist., 1¢76, 95; Man. Vert., 1576, 
294; Ann. Lye. Nat. Hist. N. Y., xi, 1877, 347.—NELSON, Bull. No. 1, Ills. Mus. Nat. 
Hist., 1876, 48 —JORDAN and COPELAND, Check List, 1876, 157. 
Minytrema melanops, JORDAN, Man. Vert., 2d Ed., 1878, 318; Bull. U. S. Nat. Mus., xii, 
1873, 158. 
Catostomus fasciatus, (LESUEUR MSS.) Cuv. and VAL., Hist. Nat. des Poissons, xvii, 1844, 
449.—STORER, Synopsis, 1846, 426 —GUNTHER, Cat. Fishes Brit. Mus, vii, 1863, 19. 
Moxostoma victoriw, GIRARD, Proc. Acad. Nat. Sci. Phila., 1856, 171; U. S. Mex. Bound. 
Sarv., Ichth., 1859, 35 pl. xx, f. 1-3. 
Ptychostomus haydeni, GIRARD, Proc. Acad. Nat. Sci. Phila., 1&56, 172; U. S. Pac. R. R. 
Expl., x, 1858, 220, pl. xlix, f. 1-4. 
Teretulus haydeni, JORDAN and COPELAND, Check List, 1876, 157. 
Teretulus suceita, JORDAN and GILBERT, in Klippart’s Rept. Fish Comm. Ohio, 1877, 53. 
(Supposed to be C. sucetta, Lacepede, as it was perhaps in part the C. suceti of Cuv. 
and Val., and of Bosc.) 
Erimyzon sucetta, JORDAN, Bull. U. 8. Nat. Mus., x, 1877, 35. 
Description.--Body oblong, little compressed, the young nearly terete, the adults 
deeper-bodied ; the dorsal region not elevated ; depth about four in length, varying 
from three in adults to four and a half in the young; head not very large; four and a 
half in length of body (4} to 44); not specially depressed ; mucous pores rather strong ; 
eye small, five to six in head; mouth quite inferior, horizontal, rather small; scales 
large, firm, regularly and smoothly imbricated, in 46 (44-47) longitudinal series and 
13 (12 to 14) transverse series, not crowded forwards; fin-rays usually, dorsal 12, 
anal 7, ventrals 9; coloration dusky, with usually a black blotch behind the dorsal 
