Fia. 
Fie 
Fic. 
Fia 
Fia 
PLATE V 
1. Trachycorystes galeatus Linnaeus, 15796, creek, Yurimaguas. 
. 2. Tympanopleura nigricollis Figenmann and Allen, sp. nov. 15789, 
paratype, female, 95 mm., R. Ucayali. 
3. Tympanopleura nigricollis Eigenmann and Allen, sp. nov. 15788, 
type, male, 106 mm. to tip of upper caudal ray, Iquitos. (See 
also pl. vi, fig. 3.) 
.4. Centromochlus gyrinus Eigenmann and Allen, sp. nov. 15795, type, 
55 mm., brook near R. Itaya, Iquitos. 
. 5. Pimelodus altissimus EKigenmann and Pearson, sp. nov. 15797, 
type, 182 mm. to end of middle caudal rays, R. Ucayali, near 
Orellana. 
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