ANNOTATED LIST OF THE SPECIES LAP 
snout and eye or a little more, reaching ventrals or farther; humeral plates separated 
from ventrals by one plate; caudal deeply forked, the upper lobe longer. Adipose 
spine conical, sharp, more than 2 in dorsal spine. Somewhat longer behind dorsal 
spine than before; caudal peduncle equal to snout. 
Mouth moderate, lobes of lower lip somewhat prolonged, acute, suggesting 
a barbel. 
A black band across the nape and back along the sides, following the middle 
of the upper series of plates, to the scales at the base of the upper lobe of the caudal, 
and continued faintly along middle caudal rays. No other markings except a 
cloudy line along the spines of fins and a faint dark area on the middle of the sides, 
even with the distal half of the pectoral. 
155. CoRYDORAS STENOCEPHALUS Eigenmann and Allen, sp. nov. 
Plate XII, fig. 2 
15817, 1, 59 mm., type, Yarinacocha, Allen, September, 1920. 
Near C. armatus; differs in its greater depth; dorsal basis longer than its 
distance from origin of adipose; snout greatly prolonged. 
Head 3, depth 2.66; D. I, 8; A. I, 7; plates 23 above, 20 below; interorbital 3 
in the head; snout three times as long as the postorbital part of the head; eye 4.3 
in the head; fontanel broad and deep, its groove to the base of the occipital process, 
which is as broad as long and concave laterally; barbels reaching the vertical from 
the front margin of the eye; snout pointed, the suborbital reaching about one 
fourth of the space to the upper lip; dorsal spine nearly equals length of snout; 
base of dorsal equals its distance from the adipose plus half the adipose; three 
azygous plates; pectoral spine about equal to dorsal spine or longer; adipose spine 
elongated, 1.5 in the dorsal spine. 
Somewhat longer behind dorsal spine than before; dorsal contour of head 
very convex, the apex a distinct transverse ridge between the fontanel and nares; 
mouth very narrow, width slightly less than orbit, about 5 in the length of the head. 
Anal notched into the ventral contour; caudal peduncle contracted in its depth 
to a measurement contained in the fontanel 1.25 times; humeral plates widely 
separated except at cephalic extremity. 
In this specimen the lower lips prolonged into barbels, the right one shrunken, 
abnormal, and forked, forming a letter-Y. 
156. Coryporas mEpiscop! Eigenmann and Allen, sp. nov. 
Plate XII, fig. 3 
15605, 1, 33 mm., type, Rio Morona, Allen, October, 1920. 
15816, 3, 40-45 mm., paratypes, Yarinacocha, September, 1920. 
Similar to Corydoras acutus, differing in having about one more lateral plate 
of each series, dark area of dorsal covering distal ends of five rays, dark zigzag 
pencilling along contiguous margins of the lateral plates. 
Length to base of caudal 123 mm., head 8 mm., depth 10 mm., interorbital 
