FISHES OF THE FAMILY LOKICAEIIL\E. 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 \ as long ; length of base of dorsal 

 equal to its distance from middle of spine of adipose fin. A. I 4. Pectoral spine 

 extending to anterior \ of ventral. Caudal emarginate. Caudal peduncle 2| 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. 



Eigenmann 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 robinii Cuv. & Val. Hist. Nat. Poiss. xv. p. 501 (1840). 



Depth of body 4|-4f times in the total length, length of head about 3f times 

 Depth of head If times in its length, breadth of head 1-g-lJ times, length of snout 

 If 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. I 7, the first ray equal in length to the head, the last f 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 3^ 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 un^e. 



Plecostomus robinii (non Cuv. & Val.) Giinth. Cat. Fish. v. p. 236 (1864) ; Steind. Sitzb. Ak. 



Wien, lxxiv. 1876, p. 676; Eigenm. & Eigenm. Proc. Cal. Ac. (2) i. 1888, p. 170, and Occ. 



Pap. Cal. Ac. i. p. 412 (1890). 

 Plecostomus una Steind. Sitzb. Ak. Wien, lxxvii. 1878, p. 383. 

 vol. xvii. — part in. No. 4. — October, 1904. 2 q 



