ANNOTATED LIST OF THE SPECIES 95 
25. RHAMDIA RIOJAE Fowler 
Plate X, fig. 3 
?Rhamdia dorsalis Gill, 1870, Proc. Acad. Nat. Sei. Phila., 94, upper Amazon. 
Pimelodus humilis Cope, non Giinther, 1878, Proc. Amer. Phil. Soc., XVII, 674, Rioja, near Moyo- 
bamba, Peru. 
Rhamdia riojae Fowler, 1915, Proc. Acad. Nat. Sci. Phila., 2, Rioja, erected on Cope’s specimens of 
P. humilis. 
Fie. 15. Puerto Bermudez, Rio Pichis. The head of launch navigation during the rainy season, 
and the end of the Via Central. The spreading deciduous tree on the further bank is the dominant 
species of the forest, the silk cotton, or kapok tree. From the verandah of the government tambo, 
or rest-house. 
Along eastern fringe of Peruvian Andes 
-— — M.C.Z., 1, 1800 feet, Rio Comberciato, Edmund Heller. 
— M.C.Z., 11, 1800 feet, Rio Comberciato, Edmund Heller. 
———— M.C.Z., 2, 3400 feet, Rio Comberciato, Edmund Heller. 
- —C.M., 2, Rio Comberciato, Edmund Heller. 
= C.M., 2, Santa Ana, Rio Urubamba, Edmund Heller. 
= C.M., 2, Rio Comberciato, Edmund Heller. 
— —].U.M., 6, Rio Comberciato, Edmund Heller. 
The Comberciato specimens measure 93-192 mm., those from Santa Ana 70-109 mm. 
Head 4.24.3; depth 5.66—-6.33; D. I, 6 in eighteen specimens, I, 7 in two; A. 
13-14; adipose fin 3.33-4; distance between dorsal and adipose one third to one half 
the length of the adipose. Maxillary barbel extending about to tip of ventrals, 
rarely to origin or middle of anal; eye 6-7 in the head, 2.3-3 in snout, 1.66—2.33 in 
interorbital; snout longer than interocular width; depth of caudal peduncle 9—9.5 
in the length; width of head 0.66—0.8 in its length; depth of premaxillary band of 
teeth 6-8 in its width. 
