y. UEMirmrs. 299 



in H. notatus ; but the lateral spot is of an ovate form, and its middle 

 corresponds to the thirty-eighth scale of the lateral line. 

 River Capiii. 



a-b. Eight inches long. Purchased of Mr, Stevens. 



3. Hemiodus imimaculatus. 



PCliarax, sp., Gronov. Zooph/l. i. p. 123. no. 379. 



Sahuo uuimaculatus, Bl. taf! 381. fig. 3 (bad) ; Bl. Schn. p. 412. 



Hemiodus crenidens, Midi. Archiv, 1842, p. 324. 



unimaculatus, 311111, ^- Trosch. Hor. Ichth. iii. p. 9 ; Cuv. iJj- VaL 



xxii. p. 124 ; K)ier, Detilischr. Wien. Acad. 1859, xvii. p. 158. 



D. 11. A. 11-12. V. 11. 



The scales are of moderate size ; those below the lateral line are not 

 larger than those above. An ovate black spot immediately above the 

 lateral line, behind the dorsal fin ; each caudal lobe with a blackish 

 longitudinal band. 



Northern Brazil. 



4. Hemiodus gracilis. 

 D. 11. A. 10. V. 11-12. L.lat. 42, L. transv. 7/5. 



The scales above and below the lateral line are equal in size. The 

 height of the body is contained six times in the total length (without 

 caudal), the length of the head four times and a third ; the distance 

 between the gill-opening and the vertical from the origin of the dorsal 

 is scarcely less than the length of the head. Upper jaw Avith about 

 twenty crenulated teeth. Eye with broad adipose lids. The ventral 

 fin is longer than the pectoral, and terminates at a great distance 

 from the vent. Silvery with golden reflexions ; a black caudal band 

 along the lateral line, commencing in the vertical from the extremity 

 of the ventral fins, and proceeding to the root of the caudal fin, where 

 it is bent downwards, running along the lower caudal lobe, the re- 

 mainder of which is red. 



lliver Cupai. 

 a-h. Four inches long. Purchased of Mr. Stevens. 



5. Hemiodus semitseuiatus. 

 Kner, Denkschr. Wien. Acad. 1859, x\u. p. 154. taf. 4. fig. 7. 

 D. 11. A. 10. V. 11. L. lat. 5()-58. L. transv. 9/5. 

 The scales above and below the lateral line are equal in size. The 

 height of the body is contained four times in tlie total length (with- 

 out caudal), the lengtli of the head four times and two-thii-ds. The dis- 

 tance between the gLll-openiiig and the vertical from the origin of the 

 dorsal equals the length of the head. Upper jaw witli about twenty- 

 eight crenulated teeth. Eye with broad adipose lids. The ventral 

 fin is milch longer than the pectoral. A black band proceeds from 

 a black spot on the lateral line behind the dorsal fin to the root of 

 the caudal ; each caudal lobe with a blackish longitudinal baud. 

 Rio Negro, Rio Guapore. 



