FISHES OF THE FAMILY LOKICAEIIDjE. 2C1 



caudal. Pectoral spine extending to base of ventral. Caudal truncate or slightly 

 emarginate, the outer rays produced. Caudal peduncle l-f-2 times as long as deep. 

 Numerous round blackish spots on head, body, and fins. 



Total length 320 mm. 



Two specimens (including the type of the species): E. Amazon; Marajo Island. 



3. PsEUDACANTHICUS FORDII. 



Cluetostomus fordii Giintli. Proc. Zool. Soc. 1868, p. 231, pi. xxi. 

 Hemiancistrus fordii Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 43. 



Depth of body 5f- of times in the total length, length of head 3 times. Breadth 

 of head 1-g- times in its length, diameter of eye 8 times, interorbital width 

 3^-3-g- times, length of snout If times. Lower jaw with G-8 teeth on each side. 

 1). I 8 ; length of base of dorsal equal to its distance from the caudal. A. I 5, 

 extending, when laid back, §— f of the distance from its base to the caudal. Pectoral 

 spine extending to base of ventral. Caudal slightly emarginate, the outer rays 

 produced. Caudal peduncle 2-2^ times as long as deep. Brown, with small white 

 spots on body and fins. 



Total length 180 mm. 



Four specimens : Surinam. 



4. fPSEUDACANTHICUS HYSTRIX. 



Rinelepis hystrix Cuv. & Val. Hist. Nat. Poiss. xv. p. 486 (1840). 

 Chcetostomus hystrix Capello, Jorn. Sci. Lisboa, ii. 1870, p. 64, pi. vii. 

 Hemiancistrus hystrix Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 43. 



This species is apparently closely allied to P. fordii, but the differences seem too 

 great to be clue to changes during growth in the same species. The only specimen 

 known, from the Rio Negro, is 760 mm. in total length, and has been described and 

 figured by Capello. The most noticeable features are the small eye (diameter 15 times 

 in the length of head), the long pectoral spine, extending to the extremity of the 

 ventral, and the length of the base of the dorsal considerably less than its distance 

 from the adipose fin. 



8. ACANTHICUS. 



Acanthicus Spix, Gen. et Spec. Pise. Bras. p. 2 (1829) ; Giinth. Cat. Fish. v. p. 253 (1840) ; 



Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 46, and Occ. Papers Cal. Ac. i. 1890, 



p. 440. 

 Rinelepis (part.) Cuv. & Val. Hist. Nat. Poiss. xv. p. 479 (1840). 



This genus differs from Ancistrus in the great development of the temporal plates, 

 which extend back far beyond the clavicles, so that the first two or three scutes of the 



