ARBOREAL RICE RATS — HERSHKOVITZ 



aif 



nhf . 



alf 



523 



RIGHT UPPER MOLARS 



LEFT LOWER MOLARS 



FIRST UPPER MOLAR 

 BUCCAL VIEW 



Figure 3. — Molars of Oecomys: a diagrammatic composite of the enamel pattern. The 

 basic elements and some of the variations present in the upper and lower molars of Ory- 

 zomys (Oecomys) bicolor and 0. (0.) concolor are shown. Explanation of symbols on 

 opposite page. 



