FISHES OF THE FAMILY LORICARIID®. 247 
base of dorsal a little less than its distance from the adipose fin, which is preceded by a 
keel formed by 3 scutes. A.1I4, Pectoral spine not reaching base of ventral. Caudal 
peduncle 3] times as long as deep. Olivaceous, all the fins except the anal with small 
dark spots on the rays. 
Total length 100 mm. 
One specimen from the Marcapata Valley, E. Peru, collected by Mr. Ockenden. 
4. Cumrostomus BREVIS, sp. n, (Plate XIII. fig. 3.) 
Depth of body about 43 times in the total length, length of head about 31 times. 
Head as broad as, or a little broader than long and about 12 times as long as deep. 
Diameter of eye 7-10 times in the length of head, interorbital width 3 times, length of 
snout 13-13 times. Length of mandibular ramus little greater than the interorbital 
width. Interoperculum with 5-8 short spines. 24 scutes in a longitudinal series, 6-7 
between dorsal and adipose fin, 10-12 between anal and caudal. D. I 8, the first ray 
equal to { the length of head, the last }—3 as long ; length of base of dorsal equal to its 
distance from middle or posterior half of spine of adipose fin. A.1I4. Pectoral spine 
extending to base or anterior } of ventral. Caudal slightly and obliquely emarginate. 
Caudal peduncle twice as long as deep. Olivaceous; sometimes a network of dark 
lines on the head; membrane of dorsal usually blackish, sometimes with a row of light 
spots in front of each ray. 
Total length 200 mm. 
Six specimens from the Bomboiza and Zamora Rivers, Eastern Ecuador, collected by 
Dr. H. Festa, had been referred by Boulenger to C. microps in his account of the Festa 
Collection. 
5. {CHATOSTOMUS TACZANOWSKII. 
Chetostomus taczanowskii Steind. Denkschr. Ak. Wien, xlvi. 1882, p. 23, pl. v. fig. 2. 
Depth of body 5-53 times in the total length, length of head 3 times. Head as 
broad as long and 1{-2 times as long as deep. Diameter of eye 9-101 times in the 
length of head, interorbital width 3-5} times, length of snout 12 times. Inter- 
operculum with S-10 spines. 26 scutes in a longitudinal series, 6-7 between dorsal 
and adipose fin, 9-11 between anal and caudal. D. I 8, the first ray equal to 2_3 the 
length of head, the last 3 as long; length of base of dorsal equal to its distance from 
the last | of the spine of the adipose fin. A.14. Pectoral spine extending to anterior 
4 of ventral. Caudal slightly and obliquely emarginate. Caudal peduncle 2} times as 
long as deep. Olivaceous; the young with dark spots on the caudal. 
‘The typical examples from the Rio Huambo and the Rio de Tortora, Peru, measure 
up to 170 mm. in total length. 
VOL. XVII.—ParT lil. No. 8.—October, 1904. Wi 
