PLATE X 
Frias. 1 AND 2. Ancistrus occlot Kigenmann and Myers. 15067, type, 115 
mm., Ollantaitambo, Heller coll. 
Fig. 3. Rhamdia riojae Fowler. Upper Urubamba, Heller coll. 
Fia. 4. Pimelodella roccae Eigenmann. Rio Comberciato, Heller coll. 
Fia. 4a. Pectoral spine of the same. 
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