3. SCLEEOGNATHUS. 23 



Bubalichthys urus, taurus et vitulus, Agassiz, I. c. xix. 1855, p. 77. 

 niger, bubalus et bonasus, Agassiz, I. c. 



D. 28-29. A. 10. L. lat. 35-38. L. transv. 7i/8i. 



Mouth inferior ; the pharyngeal teeth increase in size downwards, 

 the lowest being lamelliform, of rather small size. The height of 

 the body is more than one-third of the total length (without caudal). 

 Anterior dorsal rays of moderate length. 



United States. 



a. Young : skin. Ohio. Purchased of Dr. ParneU. 



A fiue specimen from Burlington, Iowa, is in the Liverpool 

 Museum. 



2. Sclerognathus meridionalis. 



Giiitth. Trans. Zool. Sue. 18U8 (not yet published). 



D. 29-30. A. 10. L. lat. 38. L. transv. 7|/7|. 



Mouth small, inferior, slightly corrugated . The height of the body 

 is contained thrice and one-third or thrice and one-fourth in the 

 total length (without caudal), the length of the head four times or 

 four times and a half; head not much longer than high. Eye rather 

 small, one-hfth of the length of the head, and two-thirds of that 

 of the snout ; suborbitals narrow. The anterior dorsal rays are not 

 much produced, being shorter than the head. Caudal fin forked. 

 The origin of the ventral fin is vertically below the fourth dorsal ray. 

 Pectoral fin not extending to ventral. There are five longitudinal 

 series of scales between the lateral line and the root of the ventral. 

 Coloration uniform. 



Pharyngeal teeth very numerous and small, increasing somewhat 

 in size downwards. 



liio Usumacinta (Guatemala). 



a-d. From 9 to 10 inches long. From Mr. Salvin's Collection. 

 3. Sclerognathus elongatus. 



Catostomus elongatus, Lesueur, Journ. Ac. Kat. Sc. i. p. 103 ; Kirt- 



land, Host. Journ. Nat. Hist. v. p. 267, pi. 19. fig. 3. 

 Cycleptus, (^Rqfinesque) Agassiz, I, c. p. 82. 



D. 35. A. 8. 



Scales large. Mouth inferior ; pharyngeal teeth of moderate size, 

 increasing in size downwards. The height of the body is about one- 

 fourth of the total length (-without caudal). Anterior dorsal rays 

 and caudal lobes prolonged. 



Mississippi and tributaries. 



4. Sclerognathus asiaticus. 

 Caxpiodes asiaticus, Bh^ek. Xcderl. Tydschr. Dierk. ii. 18G4, p. 19. 

 D. 52. A. 13. L. lat. 50. L. transv. 12/?. 

 The height of the body is two-fifths of the total length (without 

 caudal). Suborbitals narrow. Caudal fin deeply forked. (Bleel:) 

 Xorthern China. 



