128 OSTARIOPHYSI. 
5. Arius multiradiatus. 
Arius multiradiatus, Giinth. Cat. Fish. v. p. 173 (1864) °. 
Tachysurus multiradiatus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 182°. 
Tachysurus emmelane (Gilb.), Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1900, p. 2786°; Gilb. & 
Starks, Mem. Calif. Ac. Sci. iv. 1904, p. 31, t. 6%. 
Depth of body 5 in the length, length of head 34. Breadth of head 12 in its length, diameter of eye 7. 
Fontanel produced into a groove which nearly reaches the parieto-occipital ; occipital process without 
distinct keel, broader than long, with concave sides and slightly emarginate apex; dorsal shield small, 
subcrescentic. Width of mouth 2 the width of head; premaxillary band of teeth 4 times as long as 
broad; teeth on the palate obtusely conical, in two small, well-separated, subovate patches ; maxillary 
barbel extending to basal part of pectoral. 11 gill-rakers on the lower part of anterior arch. Dorsal 
I 7; spine 3 the length of head ; adipose fin shorter than the dorsal. Anal 27. Pectoral spine 3 the 
length of head, with the inner edge rather strongly serrated. 
Hab. Panama!?4 (Boucard). 
Here described from a specimen measuring 230 mm. in total length. 
6. Arius hypophthalmus. 
Arius hypophthalmus, Steind. Sitzungsb. Ak. Wien, Ixxii. 1876, p. 581, t. 10°. 
Tachisurus gulosus, Higenm. & Eigenm. Occ. Papers Calif. Ac. Sci. i. 1890, p. 93°. 
Cathorops hypophthalmus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 133°. 
Cathorops gulosus, Jord. & Everm. 1. c.*. 
Hab. Panama!??4, 
4, RHAMDIA, Bleek., 1858. 
Rhamdia, Jord. & Everm, Bull. U.S. Nat. Mus. xlvii. 1896, p. 149. 
Body elongate. Snout not greatly produced; mouth terminal or subterminal; jaws with villiform teeth in 
bands; palate toothless; nostrils remote from each other; no nasal barbels; barbels 6; occipital 
process not extending to the dorsal fin. Dorsal fin with a slender flexible spine and 5 to 8 branched 
rays; adipose fin long; anal short or of moderate length ; ventral fins 6-rayed. 
Numerous species, from Mexico to the La Plata. 
Synopsis of the Mexican and Central-American Species *. 
I. Caudal fin deeply notched, the middle rays not more than 4 the length of the longest. 
A. Width of mouth 2 to 4 the width of head; pectoral spine 4 to 3 the length of head. 
Occipital process as broad as long, extending } of the distance from its base to 
the origin of dorsal; body rather deep (depth 44 to 5 in the length) . . 1. parryi. 
Occipital process much longer than broad, extending 3 of the distance from its 
base to the origin of dorsal; body rather slender (depth about 6 in the 
length) ; first branched ray of dorsal the longest . . . - - ... « + 2 motaguensis. 
* The original description of P. brachypterus, Cope (Trans. Am. Phil. Soc. 1866, p. 404), from Orizaba, is 
insufficient, but Fowler’s re-description of the type (in Meek, Publ. Columbian Mus., Zool. v. 1904, p. 21) 
shows that this species is probably not distinct from P. guatemalensis. 
