REVIEW OF EAFINESQUE ON AMERICAN FISHES. 35 



seemed to suppose. Of all the Sucters, it is the most readily affected 



by iimpure water, and it is usually to be found only in clear, running 



stveams. 



* 4th subgenus TERETULUS. (p. 57.) 



Of the species assigned to this subgenus, three belong apparently to 

 Myxostoma, three to Catostomus proper, two to Hypentelium, five to 

 Enmyzon, one is a Cyprinoid, and the last a myth. 



As the name Teretulus has been restricted to the genus typified by 

 Catostomus aureolus Le S., it is best to consider it as a synonym of 

 Myxostoma. 



1 60th species, Black-face Sucker, CA.TOSTOMITS MELANOFS, Catostome 

 melanopse. (p. 57.) 



Erimyzon sucetta (Lac.) Jor. 



? Cyprinus sucetta Lac. 

 Catostomus melanops Kirtland. 

 Ptycliostomus melanops Agassiz and authors. 

 Erimyzon melanops (Raf.) Jordan. 



Description poor but unmistakable. This fish has the air-bladder in 

 two parts, and the lateral line is obsolete, as stated by Kirtland. It is 



head brown above, snout gibbose rounded ; dorsal fin hardly falcate with 14 rays, anal 

 auceolate with 8 rays; lower fins yellowish. 



Found below the falls. Length from 6 to 10 inches. It lives in muddy banks and 

 conceals itself in the mud. Flesh very soft. Head large, flattened above, mouth large, 

 eyes large. Iris silvery. Lateral line hardly raised at the base. Dorsal fin above the 

 abdominal, fins olivaceous as well as the tail, which has 20 rays. Pectorals with 18 

 rays. Scales large. 



* Body elongate cylindrical or somewhat quadrangular, 9 abdominal rays, dorsal fins 

 commonly small, tail equally forked. 



An extensive subgenus, to which belong all the following species of Le Sueur: C. 

 aureolus, C. macrolepidoius, C. Ion gi rostrum, C. nigricans, C. vittahis, C. mactdosus, C. su- 

 cetta, besides the C. teres and C. oblongus of Mitchill. 



t Diameter one-seventh of the length ; head squared, blackish above, snout convex 

 obtuse ; back olivaceous, sides whitish with scattered black dots, a black spot on the gill 

 cover, and a large one between the dorsal and caudal fins ; lateral line straight, dorsal 

 tin with 14 rays, jinal with 9 rays. 



A singular species seen at the falls. It is rare, and called Spotted Sucker or Black 

 Sucker. Length from 4 to 6 inches; body cylindrical, flattened beneath as far as the 

 vent. Head flat above, blackish thera and in the fore part. Mouth almost terminal 

 with thick whitish lips, the lower one shorter and thicker, a few small black spots ou 

 the sides of the head, aud a large one on the preopercule. Gill cover silvery. Eyes 

 black, iris brown with a gold ring. Back of a rufescent color with gold shades. A 

 very large black patch above the anal fin before the tail. Sides pale tcith small unequal 

 black dots, belly whitish. Fi7is coppery, the pectoral elliptical elongated with 18 rays, 

 iho anal elongated reaching the tail, the dorsal broad and opposed to the abdominals 

 Tail with 20 rays. Scales rather large nervose radiated. 



