114 OSTARIOPHYSI. 
6. OXYLORICARIA, Bleek. 
Ovyloricaria, Regan, Trans. Zool. Soc. xvii. 1904, p. 297. 
Differs from Loricaria in the numerous, setiform teeth and the absence of an orbital notch, 
Seven species from Panama and South America. 
1. Oxyloricaria panamensis, Eigenm. 
Loricaria aurea, Steind. Denkschr. Ak. Wien, lxxii. 1902, p. 138, t. 5. fig. 1. 
Oxyloricaria panamensis, Regan, Trans. Zool. Soc. xvii. 1904, p. 301. 
Body slender, elongate; snout produced as a rostrum. 
Hab. Paxama.—Cotomsia, Rio Magdalena. 
Fam. 2, SILURIDZ. 
This is one of the largest families of fishes, comprising over 1000 species, 
and is nearly cosmopolitan. The Mexican and Central-American Silurids may be 
recognized by the naked body, the presence of two to four pairs of barbels, the short 
anteriorly placed dorsal fin, the first ray of which is a more or less strong spine, the 
presence of an adipose fin, and the spiny outer ray of the pectoral fins. 
In Mexico and Central America there are about sixty species, comprising (1) marine 
Cat-fishes of the genera Arius, Galeichthys, and Ailurichthys, most of the species of 
which seem to enter fresh-waters ; (2) fishes of the South-American fresh-water genera 
Rhamdia, Pimelodus, and Conorhynchus; and (8) the North-American fresh-water 
types, Amiurus and Leptops. 
Synopsis of the Mexican and Central-American Genera. 
I. Nostrils close together ; teeth on the palate; no nasal barbels ; ventral fins with 6 rays. 
A. Teeth on the palate villiform. 
Four barbels . 2 2. ee ee ee ee ee ew ee 1 Avuricurays. 
Six barbels. 2. . . ww eee we ee ee ew ee) (OR 6 GALEICHTHYS. 
B. Teeth on the palate granular or obtusely conical; six barbels. . . 3. Anius. 
II. Nostrils well separated ; palate toothless. 
A. No nasal barbels ; barbels 6; ventral fins with 6 rays. 
1. Adipose fin long; jaws with well-developed teeth. 
Dorsal fin-spine slender, flexible; occipital process not nearly reaching the 
dorsal fin... 6 ew ee ee ee ee ew wee ee 6 RAMDIA, 
Dorsal fin-spine pungent; occipital process extending to shield at base of 
spine of dorsal fin . . 2. . 0. 0. 1 ew ee we ee we ee) 6S Pie opus. 
2. Adipose fin rather short, shorter than the anal ; teeth in the jaws 
feeble or absent. 2. © 1 6 ee ee we we ew ee «66, CONORHYNCHUS. 
