FISHES OF THE FAMILY LORICARIID®. 231 
Abdomen in great part covered with granular scales. D. I 7, the first ray as long as 
the head; length of base of dorsal a little more than its distance from adipose fin. 
A. I 4. Pectoral spine extending beyond base of ventral. Caudal emarginate. 
Caudal peduncle about 23 times as long as deep. Numerous small dark spots on 
head, body, and fins. 
Total length 280 mm. 
One specimen (a skin): Veragua, Pacific Slope of Panama. 
11. fANCISTRUS BRACHYURUS. 
Ancistrus pictus (non Casteln.) Kner, Denkschr. Ak. Wien, vil. 1854, p. 277, pl. iv. fig. 2. 
Ancistrus brachyurus Kner, t. ec. p. 279, pl. iv. fig. 1. 
Chetostomus pictus Giiuth. Cat. Fish. v. p. 242 (1864). 
Chetostomus brachyurus Giinth. t. ec. p. 243. 
Hemiancistrus pictus Bigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 43; Kindle, Ann. Ac. 
N. York, viii. 1895, p. 254. 
Hemiancistrus brachyurus Bigenm. & Eigenm. 1. c.; Kindle, t. c. p, 255. 
Apparently closely allied to A. aspidolepis, with which it agrees in the depressed 
head with broad snout and the strongly carinate scutes. Diameter of eye 5 times in 
the length of head (in specimens 150 mm. in total length). Interoperculum with 
about 20 setiform spines, the longest equal to 3 the length of head. 23-24 scutes in 
a longitudinal series, 12 between anal and caudal. Abdomen naked. D. I 7, the 
first ray shorter than the base of the dorsal, which is considerably longer than its 
distance from the adipose fin. A. I 5. Pectoral spine extending nearly to the 
middle of ventral. Caudal obliquely truncate. Head and body usually marbled with 
light and dark, fins with two or three dark cross-bands; in the young, body with five 
vertical bars, fins with one or two cross-bands. 
Rio Negro. 
12. ANCISTRUS SCAPHIRHYNCHUS. 
Ancistrus scaphirhynchus Kner, Denkschr. Ak. Wien, vii. 1854, p. 280, pl. iii. fig. 2. 
Chetostomus scaphirhynchus Giinth. Cat. Fish. v. p. 244 (1864). 
Hemiancistrus scaphirhynchus Bigenm. & Eigenm. Proc. Cal. Ac. (2) 11. 1889, p. 43, and Occ. Pap. 
Cal. Ac. i. 1890, p. 419; Kindle, Ann. Ac. N. York, vii. 1895, p. 254. 
Depth of body 63 times in the total length, length of head 3 times. Head 1} times 
as long as broad and 25 times as long as deep. Diameter of eye 73 times in the 
length of head, interorbital width 1} times, length of snout twice. Length of 
mandibular ramus 3? times in the interorbital width. Snout broad, rounded; head 
nearly flat above, without keels or ridges; interoperculum armed with about 15 
slender spines, the longest 13 times the diameter of eye. Scutes spinulose, carinate 
except those of the upper series and the anterior ones of the second series, 26-27 in a 
longitudinal series, 8 between dorsal and adipose fin, 13 between anal and caudal. 
VOL. XVII.—Part UI. No. 6.— October, 1904, 21 
