285. Bulletin American Museum of Natural History. [Vol. XXXIV, 
Fig. 12. Same specimen as Fig. 11. Oblique view of left maxillary toothrow. 
Fig. 18. Mesosciurus gerrardi gerrardi (Gray). No. 34130, Am. Mus., @ ad., 
Bogoté, Colombia. Direct crown view of left maxillary toothrow. 
Fig. 14. Same specimen as Fig. 13. Oblique view of left maxillary toothrow. 
Fig. 15. Mesosciurus saltuensis bonde (Allen). No. 11184, Am. Mus., Qad., 
Minca, Santa Marta, Colombia. Direct crown view of left maxillary toothrow. 
Fig. 16. Same specimen as Fig. 15. Oblique view of left maxillary toothrow. 
Fig. 17. Mesosciurus gerrardi millert (Allen). No. 32512, Am. Mus., @ ad., 
Cocal, Western Andes, Colombia. Direct crown view of left maxillary toothrow. 
Fig. 18. Same specimen as Fig. 15. Oblique view of left maxillary toothrow. 
Fig. 19. Guerlinguetus estuans estuans (Linné). No. 34657, Am. Mus., o ad., 
Potario Landing, British Guiana. Direct crown view of maxillary toothrow. 
Fig. 20. Same specimen as Fig. 19. Oblique view of left maxillary toothrow. 
Fig. 21. Guerlinguetus estuans gilvigularis (Wagner). No. 12297, Mus. Comp. 
Zool., co ad., Obidos, Brazil. Direct crown view of left maxillary toothrow. 
Fig. 22. Same specimen as Fig. 21. Oblique view of left maxillary toothrow. 
Fig. 23. Guerlinguetus ingrami (Thomas)... No. 36487, Am. Mus., o& ad., 
Alambary, Sio Paulo, Brazil. Direct crown view of left maxillary toothrow. 
Fig. 24. Same specimen as Fig. 23. Oblique view of left maxillary toothrow. 
Pirate XIV. 
' Fig. 1. -Urosciurus: duida (Allen). No. 36153, Am. Mus., @ ad., near Mt. 
Duida, Venezuela. Direct crown view of maxillary toothrows. 
Fig. 2. Same specimen as Fig. 1. Oblique view of left maxillary toothrow. 
Fig. 3. Urosciurus igniventris igniventris (Wagner). No. 34875, Am. Mus.. 
Florencia, Caqueté, Colombia. Direct crown view of left maxillary toothrow. 
Fig. 4. Same specimen as Fig. 3. Oblique view of left maxillary toothrow. 
Fig. 5. Simosciurus stramineus stramineus (Eydoux and Souleyet). - No. 
34687, Am. Mus., 2 ad., Daule, Ecuador. Oblique view of left maxillary toothrow. 
Fig. 6. Same specimen as Fig. 5. Direct crown view of maxillary toothrows. 
Fig. 7. Hadrosciurus flammifer (Thomas). No. 16944, Am. Mus., o& ad., La 
Union, Venezuela. Oblique view of left maxillary toothrow. 
Fig. 8. Same specimen as Fig. 7. Direct crown view of left maxillary tooth 
row. 
