new South-Americin Fishes. 627 
peduncle subcylindrical, neither distinctly compressed nor 
depressed, without keel. 180-200 scales in front of the dorsal. 
A silvery lateral stripe, becoming broader posteriorly; a 
more or less distinct dark spot above the base of pectoral. 
Total length 450 mm. 
Three specimens from the rivers of N.W. Ecuador. 
This species appears to be nearest to B. scapularis, Jord. 
& Gilb., from which it is distinguished by tne longer head, 
smaller eye, and more numerous scales. 
Centropomus atridorsalis. 
Depth of body 34 times in the total length, length of head 
22 times. Diameter of eye 5 times in the length of head, 
interorbital width 64 times. Length of snout 11 times the 
diameter of eye. Maxiilary extending to below middle of eve, 
the breadth of its distal extremity equal to $ the diameter of eye. 
Przeorbital with 5-7 serre. Anterior ridge of preoperculum 
with 2 spines, posterior margin serrated, with 2 or 3 spines at 
the angle. 13 gill-rakers on the lower part of anterior arch, 
the longest equal to 3 the diameter ofeye. Sc.525. D. VIII, 
I 10, the third and fourth spines the longest, equal to 4 the 
length of head. A. III 7, the length of the third spine 12 
times in that of the second, which is equal to $ the length of 
head and, when laid back, extends beyond the base of caudal. 
Pectorals and ventrals extending to the level of the anal 
opening. Inner caudal rays half as long as the outer. 
Lateral line blackish. Membrane of dorsal and caudal fins 
and that between the second and third spines of the anal 
blackish ; fins otherwise pale. 
Total length 160 mm. 
One specimen from the Rio Vaqueria, near La Tola, 
N.W. Ecuador. 
This species is readily distinguishable from others with a 
blackish lateral line by the great length of the second anal 
spine. 
Corvina Crawfordi. 
Depth of body equal to the length of head, 32 times in the 
total length. Snout 17 times as long as the diameter of eye, 
which is 53 times in the length of head; interorbital width 
3} times. Depth of the preeorbital slightly greater than the 
diameter of eye. Maxillary extending slightly beyond the 
vertical from the anterior margin of the eye, its length 23 
times in thatof the head. Jaws with bands of small, pointed 
