SOUTH AMERICAN NEMATOGXATHI. 177 



About twenty specimens from Goyaz represent a 

 variety intermediate between this and the next. They 

 have the lips not plicate, the maxillary barbel extending 

 not quite to the caudal, the humeral plate angulated 

 above; numerous spots on head and body. 



Six other specimens from the Rio Grande do Sul, 

 Emperor's collection. Some of these have three series 

 of spots, others have six or seven rows covering the 

 sides. Two have teeth on the pterygoids. 



124b. Dorsal spine shorter than head; pectoral plate 

 subrhomboidal, its upper and its posterior margins con- 

 cave, decided angle between the two faces. 



Caudal lobes long and pointed, the rays normal; 

 upper lobe longer than head. 



Maxillary barbel long, reaching to or beyond base of 

 caudal; mentals beyond base of pectorals, postmentals 

 beyond base of ventrals. 



Eye Ij in snout, 3 to Sh in head, l|-2 in interorbital. 



Mouth at the angle, about equal to snout, 2^-2f in 

 head; a portion of the intermaxillary band of teeth pro- 

 jecting beyond the lower jaw; its depth about 4-6 in its 

 width; distance between anterior and posterior nares 1| 

 in eye. 



Opercle narrower than eye, its length li-li in the 

 diameter of the eye. 



Humeral process more angular and more slender than 

 in any other variety. 



Adipose dorsal about 5 in the length. 



Dorsal spine very nearly equal to the head in length; 

 pectoral spine Ig in head, ventral fin 1^. 



Color silvery, marked with brown; head vermiculated 



with brown; body with about four longitudinal bands of 



brown, sometimes more or less broken up into spots; a 



dark spot at base of dorsal spine; adipose dorsal spotted 



12 



