460 CALIFORNIA ACADEMY OF SCIENCES. 



the dorsal fin; 7-9 azygous plates in front of the adipose 

 fin. In the young the margin and in the adult the sur- 

 face of the lamina3 also with minute bristles. 



Coracoid processes in the ? diverging backward; in 

 the S their margins free, sometimes overlapping on the 

 breast and belly. Behind the pectoral fin the coracoid 

 and humeral processes are depressed. Distance of the 

 dorsal spine from the snout 2|— 2| in the length; the 

 dorsal spine short, broad and flat, hispid in front, about 

 3 in the head, the fin rounded, about as high as long. 

 The spine of the adipose fin higher than that of the dor- 

 sal, not flattened, thickly hispid. 



Caudal truncate, 3i-4i in the length. 



Anal obliquely rounded, much higher than long. 



Ventrals 1-1 J in the head. 



Pectoral sjDine, in the ? , 5g- in the length, its inner 

 margin finely pectinate, its outer surface setiferous; in 

 the <5 2§-3| in the length. 



Olivaceous, irregularly marked with darker; sometimes 

 everywhere with small round brown spots; sometimes 

 with broad bands across the back and marblings below; 

 ventral surface usually lighter and spotted with dark 

 brown; dorsal fins spotted with brown, usually the mar- 

 gin and anterior rays nearly black; caudal spotted with 

 brown, a broad median and narrower basal and marginal 

 cross bars of dark brown, sometimes irregularly spotted; 

 other fins spotted with brown, sometimes with a median 

 cross band; the old more uniform in color. 



Head 3h-4; depth Sl-U; D. I, 7-8; A. I, 5-7; V. 6; 

 Lat. pi. ||. 



Over one hundred and twenty-five specimens .03- 

 .225 m. 



Silva, Lake Saraca; Curupira; Tabatinga; Cudajas; 

 Gurupa; Teffe; Lake Hyanuary; Villa Bella; Para; Uer- 

 anduba; Santarem; Porto do Moz; Pernambuco; Obidos. 



