FISHES OF THE FAMILY LORICARIIDA. 229 
distance from the caudal. A.1I 4. Pectoral spine extending to the anterior third or 
middle of ventral. Caudal emarginate, the outer rays produced, Caudal peduncle 
Series ; é ‘ 
9-93 times as long as deep. Dark spots or vermiculations on the sides of the body ; 
in the young, fins with dark cross-bars, in the adult with large dark spots. 
Total length 590 mm. 
A.—Head with dark vermiculations and spots on a light background, those of the 
supraoccipital and interorbital regions with a more or less regular radiating arrangement. 
Abdomen with large dark spots on a light ground-colour, 
Seven specimens (including the types of the species and of H. pardalis): R. Amazon ; 
Guiana. 
B. A. multiradiatus var. alternans, var. nov.—Head and abdomen with light spots 
or vermiculations on a dark background. 
Three specimens: Paraguay and Southern Bolivia. 
7. fANCISTRUS PUNCTATUS. 
Ancistrus duodecimalis (non Cuv. & Val.) Kner, Denkschr. Ak. Wien, vii. 1854, p. 281. 
Plerygoplichthys punctatus Giinth. Cat. Fish. v. p. 251 (1864); Eigenm. & Eigenm. Proce. Cal. Ac. 
(2) u. 1889, p. 45; Occ. Pap. Cal. Ac. i. 1890, p. 431. 
Chetostomus punctatus Steind. Denkschr. Ak. Wien, xliii. 1881, p. 115. 
This species is stated to resemble A. gibbiceps in form. In the number of scutes 
and fin-rays, in the strongly carinate scutes, the low occipital crest, and the size of the 
eye it is similar to A. multiradiatus, from which it appears to differ notably in the 
narrower interorbital width (22-22 times in the length of head), the interoperculum 
armed with a few spines, about 2 of which are moderately elongate in the adult, and 
the pectoral spine extending only a little beyond the base of ventral. Head, body, 
and fins with rather small round blackish spots. 
Venezuela; Upper and Middle Amazon. 
8. ANCISTRUS MEDIANS. 
Ancistrus medians Kner, Denkschr. Ak. Wien, vii. 1854, pp. 256 and 281. 
Chetostomus medians Giinth. Cat. Fish. v. p. 242 (1864). 
Hemiancistrus medians Figenm. & Eigenm. Proce. Cal. Ac. (2) 11. 1889, p. 43. 
Depth of body 4) times in the total length, length of head 2? times. Head as 
long as broad and 14 times as long asdeep. Diameter of eye 4-43 times in the length 
of head, interorbital width 23-3 times, length of snout 13-1} times. Length of 
mandibular ramus 1% times in the interorbital width. Snout broad and rounded ; 
supraorbital margins raised ; supraoccipital with median elevation; temporal plates 
carinate or not; operculum reduced; interaperculum armed with 30 or more rather 
slender spines with curved tips, the longest equal to 1; times the diameter of eye. 
Scutes strongly spinulose, mostly carinate, 24 in a longitudinal series, 6-7 between 
