ElGENMANN : COLLECTIONS OF FlSHES FROM PARAGUAY. 115 



the head curved, with about fifteen straight, feeble spines along the 

 middle of the posterior surface, anterior surface with minute denticu- 

 lations along the basal part, and feeble recurved hooks near its tip. 

 Color light brown, a dark lateral band ; fins blotched with black. 

 Head 4 ; depth 5 ; D.I, 6; A. 10. 



8. Pimelodus ornata Kner. Cabezudo. 

 One specimen from Corumba (358). 



9. Pimelodus clarias (Bloch). 



One specimen from Porto Murtinho (286), one from Bahia Negra 

 (398), two specimens from Corumba (291). 



10. Pimelodus fur Reinhardt. 



One specimen from Corumba (part of 290). 



11. Pimelodus valenciennis (Kroyer). 

 One specimen, Laguna Ipacarai (451). 



12. Iheringichthys megalops Eigenmann and Ward sp. nov. (Plate 



XXXII. , Figs. 3-4). 



Type No. 10 126. One specimen, 175 mm. Bahia Negra, Rio 

 Paraguay (No. 400). 



This species resembles Iheringichthys labrosus, the only other species 

 of the genus. In every character behind the head the two species 

 appear identical. The differences in the head, comparing specimens 

 of same size, are as follows : 



a. Interorbital concave ; width of occipital process at its base equal to its length ; 

 widest part of fontanel about 2 in interorbital. Eye 3§ in the head ; snout 2l 

 in the head ; postorbital part of head 3| ; interorbital 5 ; upper Jip scarcely 

 narrowed in the middle. megalops. 



aa. Interorbital flat ; occipital process distinctly narrower than long ; widest part of 

 fontanel about 3 in interorbital. Eye 4^ in the head, 2 in the snout; snout 

 2]/% ; postorbital portion of head Sj^', interorbital 4 in the head ; upper lip 

 with a deep notch in the middle labrosus. 



Body not as wide as deep at shoulders, compressed toward caudal ; 

 head sub-conical, slightly depressed, its greatest width i^i in its 

 length, its greatest depth about 2 in its length. Snout conical ; en- 

 tire upper portion of head granulose or striate ; fontanel scarcely 

 reaching to posterior margin of eye ; occipital process as wide at base 

 as long ; distance between the nostrils slightly greater than half the 

 diameter of the eye. Maxillary barbels extending very little, if any, 

 beyond tip of caudal ; postmental barbels extending to middle of 

 pectorals ; mentals not reaching pectorals. Eye elongate, very large, 



