170 CALIFORNIA ACADEMY OF SCIENCES. 



Maxillary barbels reaching to middle of anal, mentals 

 to base of pectoral, postmentals to tips of pectorals. 



Width of mouth 2J-2 in length of head; lower jaw 

 included. Depth of intermaxillary band of teeth 5-6 in 

 its width. 



Opercle twice as long as the eye. Humeral process 

 broad, pointed. 



Caudal lobes acute, the upper lode J J longer than the 

 head. 



Dorsal spine IJ-lf in head; adipose dorsal shorter 

 than the head. Pectoral spine 1J-1| in head. 



Color uniform brownish, the young with traces of 

 longitudinal stripes. 



Four specimens, the largest .50 m. Buenos Ayres. 



123, Fimelodus pictus, 



Pimelodus pictus Steindachner, SB. Ak. Wien. Ixxiv, 1876. Ich- 

 thyol. Beitrage, v, 96 (Peruvian Amazon; Hyavary). Eigenm. & 

 Eigenm. Proc. Cal. Acad. 2d Ser. i, 134, 1888 (Hyavary). 

 Habitat: Maranon. 



Profile steep, convex, interorbital region flattish; post- 

 orbital portion of the head strongly convex in trans- 

 verse profile; occipital process keeled. Bones of the 

 head granular. 



Entire intermaxillary band of teeth projecting; vomer 

 with small patches of teeth. 



Eye 3| in head, 1J in the snout; Ij in the interorbital. 



Maxillary barbels reaching a little past the base of the 

 adipose or to the caudal; mental barbels reaching the 

 base of the pectoral ; post mentals to the tip of the 

 pectorals. 



Distance of the dorsal spine from the snout 2J in the 

 length. Dorsal spine as long as the head, serrated on 

 its posterior margin, slightly so near the tip in front, 

 finely granular below. Distance of the adipose fin from 

 the dorsal fin equals the length of the adipose fin which 

 is 6 in the length. 



