142 CALIFORNIA ACADEMY OF SCIENCES. 



§ Netuma. 



101. Tachisurus dubius (Bieekei). 



102. Tachisurus kessleri (Steindachner). 

 Locality: Panama. 



103. Tachisurus inSCUlptuS (Jordan k Gilbert). 



104. Tachisurus planiceps (Steindachner). 



105. Tachisurus platypogon (Giinther). 



Localities: Panama; Acapulco; ? Goyaz. 



106. Tachisurus OSCUlus (Jordan & Gilbert). 

 Locality: Panama. 



107. Tachisurus elatturus (Jordan & Gilbert). 



108. Tachisurus barbus (Lacepede) . 



Pimelodus commersoni Lacepe.le; Bagnio harhatus Qiioj' & Gaimard; 



Pimelodus versicolor Ca.stelnau. 

 Localities: Campos; Eio Doce; Kio Grande do Siil. 



§ HexanematicJdhys. 



109. Tachisurus seemani (GUnther). 



1 ? Arius assimilis Jordan k Gilbert (not Giiuther). 

 Locality: Panama. 



110. Tachisurus jordani sp. uov. 



? Arius assimilis Jordan & Gilbert (not Giintlier). 



Types, No. 4945. Two specimens, (^; length .256-. 26 m. Panama. 



Rather robust, the width little less than the depth; cau- 

 dal peduncle compressed. Head heavy, little broader than 

 high, its height 1| in its length, its width If-l^, its width 

 at angle of mouth 2-2J. Interorbital area flat and smooth; 

 posterior portion of the head finely and sparsely granular; 

 opercle and humeral process smooth. Occipital process 

 about as long as broad, unusually sharply keeled. Font- 

 anel extending to above posterior part of eye, continued 

 as a deep groove to base of occipital process. 



Eye large. If in snout, 5 J in head, 2 in interorbital, 2f -3 

 in interocular. 



Maxillary barbels extending to the pectoral pore, post- 

 mental at least to the gill-opening, mental about three-fifths 

 as long as the post-mental barbels. 



