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Indiana University Studies 
• i 
Plate IV. 
Figure 1. Plecostomus bolivianus Pearson. Type. No. 17011, 150 mm. 
Popoi River, Upper Beni. 
Figure 2. Plecostomus bolivianus Pearson (ventral view of the type) . 
Figure 3. Plecostomus bolivanus Pearson (dorsal view of the type). 
