148 CALIFORNIA ACADEMY OF SCIENCES. 



Color: bluish-gray above, silverj below; dorsal and 

 caudal slightly dusky, other fins plain; barbels dusky. 



Head 3i, depth 5i-5|; Br. 5; D. I, 7; A. 23. 



This species is very closely related to Arius hijpoplithal- 

 mus Steind, The differences are chiefly these: 



hypopthalmus. \ yulosus. 



Intermaxillarj' baud of teeth six ' Intermaxillary baud of teeth teu 



times as wide as deep. 



Pidatine patches of teeth consider- 

 ably deeper than the iutermaxillaiy 



times as wide as deep. 



Palatine patches of teeth h as wide 

 as the intermaxillary band, four times 



band, twice as wide as deep, the dis- , as wide as deep, the distance betwten 



tance between them ^ (1 J. & G.) 1 them 1^ diameters of the eye. 



diameters of the eye. i Snout 3t in the head. 



Snout 3f in the head. | 



XXVI. Gemdens Castelnau. 



130. Genidens genidens (Cuv & Val.) 



Genidens cuvieri d: granulosus Castlenau; Ehamdia hiukidl'B\ee\iex 



(in part). 

 Localities: Porto Alegre; Santos; Rio Janeiro; Rio Sao Matheos; Rio 



Grande do Sul. 



XXVII. AiLURiCHTHYS Baiid & Girard. 

 Pimelodus Bleeker, Silures de Suriname 65, 1864. 



131. Ailurichthys panamensis Gill- 



Aelurichthys nuchdis Giinther. 

 Locality: Panama. 



132. Ailurichthys bagre (LiuuEeus) . 



Gakichthys gronovii tfc eiduxii Cuv. & Val.; Bagrus mxcronemus Ran- 

 zani; Mystus carolinensis Gronow; Pimelodus longifiUs Mus. L. B. 

 (fide Bleeker). 



Localities: Sao Matheos; Santos; Para; Curuca; Peruambuco; British 

 Guiana; Bahia. 



133. Ailurichthys pinnimaculatus Stt-indachner. 



Locality: Panama. 



134. Ailurichthys marinus (Mitchiil). 



Siiui-us bagre (Bloch, not of Liuni.BUs); Felichthys filamentosus Swain- 

 son; Galekhthyf parrceCnw . & Val.; Galeich'hys blochii Cuv. & Val.; 

 Galekhthys bahknsis Casteluau; Aelurichthys longispinis Giinther. 



Locilities: Rio de Janeiro; Para; Bay of Balixy; Mobile Bay; Per- 

 nambuco; Victoria, Brazil. 



