1J6 Annals of the Carnegie Museum. 



3 4 in the head, i^ in the snout, 7/% in the interorbital region. Pre- 

 orbitals prominent ; interorbitals distinctly concave ; mouth very nar- 

 row, jaws not equal ; lips very thick, upper lip with its free margin 

 reflexed, scarcely, if at all notched ; upper lip extending beyond the 

 lower by ^ diameter of the eye ; teeth of the jaws in very narrow 

 bands ; no teeth on the vomer ; teeth on the pterygoids inconspicuous. 

 Dorsal spine strong, i*/ in length of head, serrate on posterior mar- 

 gin ; distance of adipose fin from dorsal slightly less than length of 

 adipose, which is 4% in the length. Caudal forked. Pectoral spine 

 strongly serrate on both margins, serrations on inner margin a little 

 the stronger, the spine a little shorter than the head. Humeral proc- 

 ess triangular, pointed behind, but not spine-like, scarcely reaching 

 to middle of pectoral spine, its surface granulose-striate. Ventrals 

 reaching to anal, margin of anal concave, some of the anterior rays ex- 

 tending much beyond tip of last. Anterior upper portion of the body 

 spotted, otherwise plain. 



Head 3^ ; depth 4^; D. I, 6 ; A. 11. 



13. Iheringichthys labrosiis (Kroyer) (Plate XXXIII., Fig. 1). 



One specimen from Corumba (290), and four from Bahia Negra 

 (382). 



14. Hemisorubim platyrhyncJws (Cuvier and Valenciennes) Jiripoca. 

 One specimen from Corumba (359). " 



15 Doras cos tat us (Linn.). 



One specimen from Corumba (364) ; another from Laguna Ipacarai 



(449)- 



16. Doras weddelli Castelnau. 



One specimen colored like the type figured by Castelnau. Tribu- 

 tary of Rio Pilcomayo (445). 



17. Oxydoras eigenmanni Boulenger. 

 Eight specimens from Corumba (365). 



18. Hemidoras paraguayensis Eigenmann and Ward sp. nov. (Plate 



XXXIV , Fig. 1). 

 Type No. 10127. One specimen, Corumba (366). 

 This species is closely related to nittereri, from which it differs in 

 the characters set forth in the following key : 



a. Depth equal to length of head ; lower jaw sometimes with patches of teeth. Max- 

 illary barbel extending to below the eye ; caudal deeply forked nattereri. 



aa. Body distinctly deeper than length of head ; lower jaw without teeth. Maxillary 

 barbel extending to gill opening. Caudal scarcely forked, the lower lobe 

 wider and longer than the upper paraguayensis sp. nov. 



