30 CALIFORNIA ACADEMY OF SCIENCES. 



Dorsal without spine or basal plate. Caudal rays rapidly 

 tapering to the middle ones which are greatly prolonged, 

 less than 21 in the length. 



Uniform yellow. 



Head4|; D. 7; A. 13. 



XVIII. Steindachneria Eigenm. & Eigenm. 

 Steindachneria doceana sp. uov. 



Types, Nos. 23792; 23793; 23794; nine specimens, .37-74 m. Eio Doce. 



Head broad, depressed, the depth at the base of the oc- 

 cipital process 2J-3 in its length, its width If. Occipital 

 process broad, not quite reaching the long, triangular dorsal 

 plate. 



Teeth of the vomer in a single patch. 



Maxillary barbels reaching to middle of dorsal in the 

 smallest, to middle of pectoral in the largest specimen. 



Base of adipose i-l longer than base of anal. 



Caudal emarginate. 



Ground color light; sides and back marked with dark 

 brown; only spots and curved bars of the ground color 

 visible on the head and back; on the sides the color is 

 about equally distributed in vermiculating stripes. Un- 

 paired, and upper surfaces of the paired fins, light, profusely 

 spotted with dark; the spots of the dorsal and pectoral con- 

 fluent into bars and stripes in the largest specimen; adipose 

 fin colored like the back; ventral surface and lower surface 

 of the paired fins plain. 



Head 3|-Hi ; depth 6i-7§; Br. 8-9; D. I, 7-8; A. 14. 



The genus Steindachneria is confined, so far as known, to 

 the rivers Parahyba, Jequitinhonha and Doce, each of 

 which has a distinct species. 



XXI. PsEUDOPLATYSTOMA Bleeker. 

 Pseudoplatystoma fasciatum reticulatum var. nov. 



Type, No. 23813; length .77 m. Rio Negro. 



