310 FISHES OF WESTERN SOUTH AMERICA 
three forms are the favorites for drying during the dry-season for consumption in 
the period of inundation. 
Widely known as boca chica for the small, suctorial mouth; the name chupadora 
was also somewhat current (in allusion to the carp-like chewing of mud and debris). 
17843, 3, 157-172 mm., Iquitos, Allen, September, 1920. 
These specimens assigned to P. nigricans show considerable departure from 
other known types. They are identical in color, in the bands of color (unless there 
are more), and in the irregular bands on fins and spot on the opercle. 
nigricans | 17842 
Taterorbitall space... ms vee iz : tae a 6.7 | 5.7 : . 
Depth ince of ical a i 3.7 eer |e 2.5-2.8 ; 
First anal ae proloneed Ra ee ene : Tete ne ene aoa a Oe | Sone feet eoitel 
or two specimens to half the last ray 
only above the lateral line 
continued below the lateral 
| line 
Rhombie outline of scales... .... 
This would ordinarily be considered sufficient ground for the creation of at 
least a subspecies, except for the fact that the Puerto Melendez specimens, 17838, 
appear to fit in midway between these aberrant Iquitos specimens and the rest. 
428. PROCHILODUS ORTONIANUS Cope 
Prochilodus ortonianus Cope, 1878, Proc. Amer. Phil. Soc., XVII, 685, Peruvian Amazon, Orton 
collection; 
Fowler, 1906 (1907), Proc. Acad. Nat. Sci. Phila., LVIII, 311, fig. 12; 
Rigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 424; 
Fowler, 1939 (1940), Proce. Acad. Nat. Sci. Phila., XCI, 258. 
Peruvian Amazon 
Known from the types and from nine specimens from the Bajo Ucayal, part 
of the Morrow collection of the Philadelphia Academy. 
429, PROCHILODUS CEPHALOTES Cope 
Prochilodus cephalotes Cope, 1878, Proc. Amer. Phil. Soc., XVII, 686, Peruvian Amazon, Orton 
collection; 
Fowler, 1906 (1907), Proc. Acad. Nat. Sci. Phila., LVIIT, 312, fig. 13; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITI, 424. 
Eastern Peru 
430. PROCHILODUS THERAPONEURA Fowler 
Prochilodus insignis Cope, 1872, Proc. Acad. Nat. Sci. Phila., XXIII, 258, Rio Ambyiacu, Hauxwell 
collection. 
Prochilodus theraponeura Fowler, 1906 (1907), Proce. Acad. Nat. Sci. Phila., LVIIT, 313, fig. 14; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sei. Phila., XCI, 260. 
