FISHES OF THE FAMILY LORICARIID#, 215 
median ridge; temporal plate not carinate. Scutes spinulose, not carinate, 26 in 
a longitudinal series, 7 between dorsal and adipose fin, 14 between anal and caudal. 
Supraoccipital entirely bordered posteriorly by a single scute. Lower surface of head 
and abdomen covered with small granular scales, except for naked areas behind the 
mouth and at the base of each ventral. D. I 7, the first ray as long as the head, not 
reaching the adipose fin when laid back, the last 3 as long; length of base of dorsal 
equal to its distance from middle of spine of adipose fin. A.14. Pectoral spine 
extending to anterior } of ventral. Caudal emarginate. Caudal peduncle 23 times as 
long as deep. Uniformly olivaceous ; dorsal with traces of darker spots or bars. 
Total length 260 mm. 
One specimen from the Rio das Velhas, Eastern Brazil, received from the Museum 
of Comparative Zoology, Cambridge, U.S.A., as P. lima. 
Kigenmann has given the name P. lima atropinnis to a specimen (presumably 
of this species) from Goyaz, with the fins uniformly dark brown. 
17. PLEcosToMUS ROBINI. 
Hypostomus robinit Cuv. & Val. Hist. Nat. Poiss. xv. p. 501 (1840). 
Depth of body 43-43 times in the total length, length of head about 34 times 
Depth of head 13 times in its length, breadth of head 13-14 times, length of snout 
1} times, diameter of eye about 10 times, interorbital width 2} times. Length 
of mandibular ramus twice in the interorbital width. Snout very broad, rounded ; 
supraorbital margins not raised; supraoccipital with moderately elevated median» 
ridge; temporal plates not carinate. Scutes spinulose, the anterior and upper scutes 
weakly carinate, 27-28 in a longitudinal series, 8-9 between dorsal and adipose fin, 
13-14 between anal and caudal. Supraoccipital entirely bordered posteriorly by 
a single scute. Lower surface of head and abdomen completely covered with small 
granular scales. D.17, the first ray equal in length to the head, the last 2 as long ; 
length of base of dorsal equal to its distance from posterior edge of base of spine of 
adipose fin. A. I 4. Pectoral extending to base of ventral or beyond. Caudal 
obliquely truncate or weakly emarginate. Caudal peduncle 53 times as long as deep. 
Numerous small dark spots on head, body, and fins, those on the dorsal larger, in 
a single series between each pair of rays. 
Total length 205 mm. 
Two specimens (including the type of the species): Trinidad ; Montevideo. 
18. PLECOSTOMUS UNA. 
Plecostomus robinit (non Cuv. & Val.) Giinth. Cat. Fish. v. p. 236 (1864) ; Steind. Sitzb. Ak. 
Wien, Ixxiv. 1876, p. 676; Eigenm. & Higenm. Proc. Cal. Ac. (2) i. 1888, p. 170, and Occ. 
Pap. Cal. Ac. i. p. 412 (1890). 
Plecostomus une Steind. Sitzb. Ak. Wien, Ixxvii. 1878, p. 383. 
VOL. XVII.—ParT 1. No. 4.—October, 1904. 
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