SOUTH AMERICAN NEMATOGNATHI. 341 



LXIII. PSEUDOSTEGOPHILUS. 



Pseudostegophilus Eigenm. & Eigenm. Proc. Gal. Acad. 

 Sci. 2d Ser. ii, 54, 1889 (nemurus). 



Type: Stegophilus nemurus Giinther. 



Caudal widely forked. Mouth inferior, each jaw with 

 series of fine teeth; upper lip with several series of fine 

 movable teeth; no teeth on the vomer. 



277, Pseudostegophilus nemurus. 



Stegophilus nemurus Giinther Proc. Zool. Soc. 1868, 429 (Upper Am- 

 azon). 



Pseudostegophilus nemurus E. & E. 1. c. (? Maranon or Ucayale). 

 Habitat: Maranon and its tributaries. 



On account of its widely forked tail this species is prob- 

 ably generically distinct from the typical Stegophilus, 

 which has a rounded caudal. 



Body comparatively short and thick; head short, as 

 broad as long, the snout broadly .rounded. Eye 1 in the 

 snout, 4 in the head. Mouth broad, upper lip with about 

 four series of fine teeth, those of the inner series longest; 

 intermaxillaries and mandibles with four or five series of 

 closely crowded, pectinate teeth. 



Opercle with a bunch of about 8 spines; preopercle with 

 similar spines. 



Origin of dorsal equidistant from tip of snout and tip 

 of middle caudal rays. Upper caudal ray 3 times as long 

 as the middle rays, 3J in the length. Anal placed en- 

 tirely behind the dorsal; origin of ventrals about equi- 

 distant from base of caudal and tip of snout. 



Pectoral pore small. 



Light; back with three large dark brown, black edged, 

 saddle-shaped spots, one behind the middle of the dorsal 

 and the other in front of the dorsal; tail with a broad 

 collar of similar color; lower caudal lobe black; upper 

 caudal lobe light marbled with blackish, its tip black. 



Head 5; D. 9; A. 7. 



