FISHES OF THE FAMILY LOKICAKIIDJE. 239 



Hrmiancistrus guacharote Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 43, and Occ. Pap. 



Cal. Ac. i. 1890, p. 421. 

 ? Hemiancistrus triniiatis Eigenm. & Eigenm. 1. c. et ]. c. 



Depth of body 6 times in the total length, length of head 2-f times. Head 1\ times 

 as long as broad and twice as long as deep. Diameter of eye 5f times in the length of 

 head, interorbital width 2^ times, length of snout 1-f-lf times. Length of mandibular 

 ramus 2\ times in the interorbital width. Head similar to that of A. heter acanthus ; 

 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 f the length 

 of head, the last f as long ; length of base of dorsal a little less than its distance from 

 the adipose fin. A. I 4. Pectoral spine extending to anterior \ of ventral. Caudal 

 deeply emarginate. Caudal peduncle 2f times as long as deep. Uniformly olivaceous. 



Total length 100 mm. 



One specimen (type of the species) : Porto Rico l ; (1 Trinidad). 



26. Axcisteus SETOSUS. (Plate XII. fig. 2.) 



Cheetostomus setosus Bouleng. Ann. Mag. Nat. Hist. (5) xis. 1887, p. 349. 

 Pse'udancistrus setosus Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 45. 



Depth of body 6-6-| times in the total length, length of head nearly 5 times. Head 

 as broad as long and 2-j 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 1^ times greater than the interorbital width. Head without ridges 

 or prominences, fiat above ; snout broad, rounded, its sides margined with bristles, 

 which are scarcely visible in the female and equal to \ 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 f the length of head. Scutes spinulose, not carinate, 

 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. D. I 7-8, the 

 first ray equal to § the length of head ; length of base of dorsal a little less than its 

 distance from caudal. A. I 3. Pectoral spine extending to anterior \ or nearly to 

 middle of ventral. Caudal obliquely truncate. Caudal peduncle 2f— 2f times as long 

 as deep. Olivaceous, body marbled, fins barred with dark spots. 



Total length 115 mm. 



Two specimens : Colombia. 



1 The occurrence of this species at Porto Hico is remarkable and requires confirmation. 



vol. xvii. — i>art in. No. 7. — October, 1904. 2 k 



