ElGENMANN \ COLLECTIONS OF FlSHES FROM PARAGUAY. 125 



50. Leporinus frederici (Bloch). 

 Two specimens, Puerto Max (407). 



51. Leporinus trifasciatus Steindachner. 



A single specimen from Bahia Negra, 310 mm. (401), and another 

 one from Ascuncion. 



Head 3^3 ; depth 4 ; eye 5^ in the head, 3 in interorbital. Scales 

 6-42-5. 



52. Leporinus affinis Glinther. 



One specimen (195), Arroyo Trementina. 



53. Leporinus hypselonoius Giinther. 



Two specimens (413) from Puerto Max, are probably the young of 

 this species. Length 18 mm. 



Depth 3 ; head 3. Body with 8 transverse bands, the last on the 

 caudal peduncle. Some of these near the middle of the body have a 

 tendency to split at the top, Y-shaped. Head with a diamond-shaped, 

 dark blotch on top, enclosing an oblong, lighter portion, and with a 

 line from eye, around lower lip, and a dark opercular blotch. 



Form somewhat different from that of the adult, especially as to the 

 head. Lower jaw more prominent, dorsal profile of head not concave 

 but forming part of an even line from dorsal fin to snout. 



Teeth strap-shaped, a pair of stronger ones set slightly behind the 

 others in the mandible. 



54. Characidium fasciatum Reinhardt. 



Two specimens, one (471) from Villa Rica and the other (448) 

 from a tributary of the Pilcomayo. The latter specimen is very pale, 

 having a faint lateral band, a black spot at base of middle caudal rays 

 and the lateral bands faint, most distinct on the back. The Villa 

 Rica specimen, on the contrary, is highly colored, the lateral band 

 wide and the vertical bands distinct. The dorsal with horizontal 

 bands and the caudal with cross-bands. 



D. n ; A. 8 ; lat. I.37. The pectoral in the Pilcomayo specimen 

 is feeble, not reaching the ventrals ; that in the Villa Rica specimen is 

 strong and reaches a little beyond origin of ventrals. The Villa Rica 

 specimen has the general habit and coloration of a darter (Etheo- 

 stoma). 



55. Odontostilbe paraguayensis Eigenmann & Kennedy. 

 Five specimens, Corumba (329). 



56. Odontostilbe trementina Eigenmann & Kennedy. 

 One specimen, Puerto Max (part of 388). 



