FISHES OF THE FAMILY LOKICABIIDiE. 217 



Twelve specimens (including co-types of P. lima and P. vermicularis) : Bahia ; 

 Rio San Francisco. 



20. Plecostomus luetkeni. 



Plecostomus lima (non Liitken) Steind. Sitzb. Ak. Wien, lxxiv. 1876, p. 67'J. 

 Plecostomus luetkeni Steind. ib. lxxvi. 1877, p. 217. 



Depth of body nearly 7 times in the total length, length of head 3^ times. Depth 

 of head twice in its length, breadth of head 1^- times, length of snout ly times, 

 diameter of eye 8 times, interorbital width 3 times. Length of mandibular ramus 

 If times in the interorbital width. Snout broad ; supraorbital edges not raised ; 

 supraoccipital flat ; temporal plates not carinate. Scutes spinulose, not carinate, 27 in 

 a longitudinal series, 7 between dorsal and adipose fin, 13 between anal and caudal. 

 Supraoccipital bordered posteriorly by a median scute and one on each side. Lower 

 surface of head and abdomen almost completely naked. D. I 7, the first ray a little 

 longer than the head, the last f as long ; length of base of dorsal equal to its distance 

 from the tip of the spine of the adipose fin. A. I 4. Pectoral spine extending a 

 little beyond base of ventral. Caudal slightly emarginate. Caudal peduncle 3 times 

 as long as deep. Large dark spots on the head and on the dorsal. 



Total length 300 mm. 



One specimen: S.E. Brazil. 



21. Plecostomus auroguttatus. 



Hypostomus auroguttatus Kner, Denkschr. Ak. Wien, vii. 1854, p. 2G9, pi. ii. fig. 3. 



Hypostomus asperatus Casteln. Anim. Am. Sud, p. 41, pi. xx. fig. 2 (1855). 



Plecostomus auroguttatus Giinth. Cat. Fish. v. p. 234 (1864) ; Steind. Denkschr. Ak. Wien, xliv. 



1881, p. 6. 

 Plecostomus johnii Steind. Sitzb. Ak. Wien, lxxiv. 1876, pt. 1, p. 691 ; Eigenm. & Eigenm. Proe. 



Cal. Ac. (2) i. 1888, p. 170, and Occ. Pap. Cal. Ac. i. p. 413 (1890). 



Depth of body about 6^ times in the total length, length of head 3-3-^ times. 

 Depth of head nearly twice in its length, breadth of head ly^ times, length of snout 

 If- If times, diameter of eye 6-8 times, interorbital width 2y-2f times. Length of 

 mandibular ramus \\ times in the interorbital width. Snout broad, rounded ; supra- 

 orbital edges slightly raised ; supraoccipital with low median elevation ; temporal 

 plates not carinate. Scutes spinulose, not carinate, 25-26 in a longitudinal series, 

 6-8 between dorsal and adipose fin, 12-14 between anal and caudal. Supraoccipital 

 entirely bordered posteriorly by a single scute. Lower surface of head and abdomen 

 almost completely covered with small granular scales ; naked areas behind the mouth 

 and at the base of each ventral. D. I 7, the first ray equal to f the length of head, 

 the last -|- as long ; length of base of dorsal a little greater than its distance from the 

 adipose fin. A. I 4. Pectoral spine, in the adult, extending nearly to middle of 



2g2 



