SOUTH AMERICAN NEMATOGNATHI. 269 



208 Centromochlus intermedius, 



Centromochlus intermedium Steiudachner, Siisswasserf. siidostl. Bras. 



iii, 106, foot note (Marabitanos; Para); id. Flussfische Sudani. 



iii, 4, 1881 (Hyutahy; Jatuarana); Eigenm. &Eigenm. Proc. Gal. 



Acad. 2d Ser. i, 156, 188S (Tajapuru; Teffe; Jatuarana; L?a; 



Jutahy; Lago Alexo). 

 Habitat: Amazon, Solimoens and tributaries from Para to Teffe. 



The depth everywhere greater than the width. Cau- 

 dal peduncle very high and compressed. Head short 

 and broad, slightly arched in transverse profile, its 

 width little less than its length, its depth 1-J 1J i n its 

 length; the surface of the bones finely granular; the 

 dorsal plate with an outward projecting process behind. 

 Humeral process extending obliquely upward, almost or 

 quite meeting the scapula. Fontanel oblong. Distance 

 between the anterior and posterior nares 1J in the eye. 



Jaws equal; mouth terminal, its width at the angles 

 less than 2 in the length of the head; teeth villiform, a 

 small patch of teeth on one side of the vomer in the ? 

 specimen. 



Eye 3J in the head, 2| in the interorbital. 



Maxillary barbel extending beyond the humeral pro- 

 cess; mental barbels short. Pectoral pore small. 



Distance of dorsal spine from the snout 3-3f in the 

 length; dorsal spine as long as the head, its anterior 

 margin serrate, its posterior margin smooth. 



Caudal deeply emarginate, the upper lobe in the 6 

 somewhat produced and pointed, 3-4J in the length. 



Base of anal rather long in the ? , the rays closely 

 crowded in the . 



Ventrals not reaching the anal. 



Pectoral spine broad, serrated on both margins, the 

 teeth 011 the outer blunt, those on the inner margin 

 sharp, sides of the spines granular. 



Color rusty brown, ventral surface white, the chin 

 very dark brown in one specimen; the lower fins whitish, 



