PLATE VI 
Fia. 1. Chaetostoma lincopunctata Eigenmann and Allen, sp. nov. 15373, 
type, 143 mm., R. Azupizti. 
Fig. 2. Hemiancistrus arenarius Eigenmann and Allen, sp. nov. 15356, 
type, 93 mm. to end of middle caudal rays, Yurimaguas. 
Fie. 3. 
Tympanopleura nigricollis FKigenmann and Allen, sp. nov. 15788, 
type, male, 106 mm., to tip of upper caudal ray, Iquitos. (See 
also pl. v, fig. 3.) 
Fie. 4. Tympanopleura alta Eigenmann and Myers, 15790, type, 128 
mm., Iquitos. 
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