178 CALIFORNIA ACADEMY OF SCIENCES. 



with brown; dorsal with smutty tips; other fins plain. 

 Color sometimes uniform. 



This variety is the one commonest in the Amazon 

 system. The museum contained specimens from Para; 

 Porto do Moz; Santarem; Obidos; Villa Bella; Coary; 

 Teffe; Fonte Boa; Tabatinga; Hyavary; Cudajas; Rio 

 Goncallo; Montalegre; Rio Reto; Rio Puty; Manacapuru; 

 Tonantins; Lago Alexo; Cameta. 



This variety could again be divided; the most western 

 specimens are more uniform in color; the color markings 

 becoming more distinct eastward as far as Santarem 

 where the color is in well-defined areas as described. In 

 some examples the profile is straight and in others the 

 head is depressed, with a marked angle at the base of 

 the occipital crest. 



In some specimens the body is much shortened and 

 deepened, and the lateral bands are broken up into spots, 

 making exact counterparts of the plate of Wiacrospila^=^are- 

 kaiviu. 



124c. A single specimen in bad condition differs from 

 the descriptions given above. 



No. 7461; .16 m. Rio San Francisco. 



Snout pointed; eye large. 3| in head, l^ in snout; 

 maxillary barbels extending beyond anal; humeral pro- 

 cess straight below, curved above, ending in a sharp 

 point. Dorsal spine Ij in head; pectoral spine as high 

 as the dorsal spine, smooth in front, sharp recurved 

 hooks its whole length behind. Internasal distance 3 

 in eye. 



124d. Maxillary barbel to end of adijjose; mentals 

 not beyond middle of pectoral; postmental to base of 

 ventral. Eye 2 in snout, 4^ in head, 1| in interorbital. 



Mouth at the angle 3 in length of head. 



Upper jaw projecting beyond the lower, depth of 

 the intermaxillary band of teeth not wider than the 

 maxillary band; internasal space 2 in the eye. 



