286 FISHES OF WESTERN SOUTH AMERICA 
Mouth inferior, cutting edge of pluricuspid teeth of the upper jaw forming a 
straight transverse line; lower teeth consisting at most of 1-3 truncate incisors, 
curved outward, on the inner side of an ampulla; gill-membranes united and free 
from the isthmus. 
375. PARODON BUCKLEY! Boulenger 
Parodon buckleyi Boulenger, 1887, Proc. Zool. Soc. London, 279, pl. xxiii, fig. 1; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 423. 
Eastern Ecuador 
Known from the type, a single specimen taken at Canelos, as a part of the 
Buckley collection. 
Genus 154: APAREIODON Eigenmann 
Apareiodon Eigenmann, 1916, Ann. Carnegie Mus., X, 71; 
BKigenmann, 1922, Mem. Carnegie Mus., IX, 109. 
Type: Parodon piracicabae Kigenmann 
Panama to northern Peru, chiefly on Pacific slopes 
Differing from Parodon chiefly in the consistent freedom of the sides of the 
mandible from teeth, ampulla small; alike in the rod-shaped proximal portion, and 
double-bladed distal portion of the mandible, and in the transverse cutting edge of 
the upper teeth, which are small at the base, horizontal, and tapering to a pectinate 
distal end. 
376. APAREIODON PONGOENSE Allen, sp. nov. 
Plate XIV, fig. 7 
———., 4, 49-70 mm., type 67 mm., and three paratypes, forest brook, foothills at Pongo de 
Manseriche, Allen, October, 1920. 
Near A. itapicuruensis Eigenmann, differing in the greater number of pre- 
maxillary teeth and slight differences in scales and finrays; subacute caudal lobes. 
Of similar general form to A. ecwadorensis and terminalis, more like the former in 
the inferior mouth; differing from both in the size and position of fins, in the simi- 
larity of the maxillary to the premaxillary teeth, in the shorter head and greater 
depth, and greater number of scale rows below the lateral line. 
Head 4.4—4.8; depth 4.5-4.6; D. 12; A. 8; P. 18; scales 4—49—4 or 5; eye 1.3 
in the snout, 3.4 in the head, 1.3 in the interorbital. 
Subcylindrical, elongate; dorsal profile moderately convex, ventral profile 
nearly straight to slightly curved; spindle-shaped forward to snout; regularly more 
and more compressed toward the caudal fin; preventral area more or less flattened, 
having a median series of 19-20 scales; rounded predorsal with a median series of 
12-13 scales. 
Mouth small and decidedly inferior; premaxillary with eight incisor teeth, 
narrowly rooted, broad at cusps, turned back nearly horizontally at apices, exposed 
