FISHES OF THE FAMILY LORICARIID®. 339 
Hemiancistrus guacharote Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 48, and Occ, Pap, 
Cal. Ac. i. 1890, p. 421. 
* Hemiancistrus trinitatis Ligenm. & Eigenm. 1. c. et 1. c. 
Depth of body 6 times in the total length, length of head 2% times. Head 1} times 
as long as broad and twice as long as deep. Diameter of eye 53 times in the length of 
head, interorbital width 2+ times, length of snout 13-14 times. Length of mandibular 
ramus 23 times in the interorbital width. Head similar to that of A. heteracanthus ; 
interoperculum armed with about 20 moderately stout spines, external to these some 
bristles which are shorter than the spines. Scutes similar to those of A. heteracanthus 
both in structure and number. Supraoccipital bordered posteriorly by a median scute 
and by one on each side. Lower surface of head and abdomen naked, except for a 
small granular patch behind each gill-cleft. D.1 7, the first ray equal to 2 the length 
of head, the last 2 as long; length of base of dorsal a little less than its distance from 
the adipose fin. A. 14. Pectoral spine extending to anterior } of ventral, Caudal 
deeply emarginate. Caudal peduncle 2# times as long as deep. Uniformly olivaceous, 
Total length 100 mm. 
One specimen (type of the species): Porto Rico!; (? Trinidad). 
26. ANCISTRUS SETOSUS. (Plate XII. fig. 2.) 
Chetostomus setosus Bouleng. Ann. Mag. Nat. Hist. (5) xix. 1887, p. 349. 
Pseudancistrus setosus Eigenm. & Eigenm. Proc. Cal. Ac. (2) 11. 1889, p. 45. 
Depth of body 6-64 times in the total length, length of head nearly 5 times. Head 
as broad as long and 24 times as long as deep. Diameter of eye 10-12 times in the 
length of head, interorbital width nearly 4 times, length of snout 1) times. Length of 
mandibular ramus 14 times greater than the interorbital width. Head without ridges 
or prominences, flat above; snout broad, rounded, its sides margined with bristles, 
which are scarcely visible in the female and equal to 4+ the length of head in the 
male; interoperculum movable, armed with slender spines, which can be, to a 
considerable extent, everted and retracted, about 15 in the female and 25 in the male, 
the longest equal to nearly 2? the length of head. Scutes spinulose, not carinaite, 
25 in a longitudinal series, 5-6 between dorsal and adipose fin, 10 between anal and 
caudal; supraoccipital bordered by a pair of scutes which exclude the first median 
scute from contact with it; lower surface of head and abdomen naked. JD. I 7-8, the 
first ray equal to 3 the length of head; length of base of dorsal a little less than its 
distance from caudal. A.1I3. Pectoral spine extending to anterior } or nearly to 
middle of ventral. Caudal obliquely truncate. Caudal peduncle 23-2% times as long 
as deep. Olivaceous, body marbled, fins barred with dark spots. 
Total length 115 mm. 
‘I'wo specimens : Colombia. 
1 The occurrence of this species at Porto Rico is remarkable and requires confirmation, 
VOL, XVII.—Part 1. No. 7.—October, 1904. 2k 
