SOUTH AMERICAN NEMATOGNATHI. 343 



bb. Back and sides plain; D. 10; A. 9; caudal with dusky spots, the tip 

 of its lower lobe being black; origin of dorsal much nearer tip of cau- 

 dal than tip of snout; head longer than broad, about 6 in the total 

 length; eye 3f in head; caudal with numerous accessory rays. (Stein- 

 dachner.) macrops 281. 



. Caudal rounded; dorsal much behind the middle of the total length. 

 D. 9-10; color uniform. 



/. Caudal without accessory rays; dorsal entirely in front of the anal; 

 head about 6 in the total length. D. 9; A. 7. (Eeinhardt.) 



insidiosus 282. 



ff. Caudal with numerous accessory rays; dorsal partly over the anal; 

 head about 7 in the total length. D. 9-10; A. 8. (Steiudachner.) 



reinhardtii 283. 



278, Stegophilus maculatus, 



Stegophilus maculatus Steindachner, Denk. Ak. Wien, xli, 25, plate 

 iv, fig. 2, 1879 (La Plata); Eigenm. & Eigenm. Proc. Cal. Acad. 

 2d Ser. ii, 54, 1889. 



Habitat: Kio Plata. 



This species is known only from the types. 



279, Stegophilus punctatus, 



Stegophilus punctatus Boulenger, Proc. Zool. Soc. Lond. March, 

 1887, 279, pi. xxi, fig. 4 (Canelos); Eigenm. & Eigenm. 1. c. 

 Habitat: Eastern Ecuador. 



280, Stegophilus intermedius, 



Stegophilus intermedius Eigenm. & Eigeum. 1. c. (Goyaz). 



Type, No. 9,842; one specimen .08 m. Goyaz. Senhor Honorio. 



This species, found in a region intermediate between 

 the localities where punctatus and maculatus are found 

 combines in a remarkable way the characters of those 

 species. 



Elongate, compressed behind, depressed forward; head 

 somewhat longer than wide, snout pointed; eye large, 1 

 in the snout, 3J in the head. Mouth large; upper lip 

 with two series of teeth; intermaxillaries and mandibles 

 with four series of depressible teeth, those of the inner 

 series enlarged at the tip. Lower lip not dilated, barbel 

 shorter than the eye. 



Opercle with two spines; preopercle with 5 or 6 claw- 

 like spines. 



Origin of dorsal about equidistant from tip of caudal 



