180 ~ Bulletin American Museum of Natural History. [Vol. XXXIV, 
Puate VI. 
All figures 2. 
Fig. 1. Syntheosciurus brochus Bangs. Type. No. 10402, Bangs Coll., Mus. 
Comp. Zoél., 7 ad. Left maxillary toothrow, direct crown view. 
Fig. 2. Tamiasciurus hudsonicus gymnicus (Bangs). No. 8205, Am. Mus.. 
# ad., Tobique River, New Brunswick. Maxillary toothrows, direct crown view. 
Fig. 3. Same specimen as Fig. 2. Oblique view of left maxillary toothrow, to 
show crenulation of outer border. 
Fig. 4. Sciurus vulgaris leucourus Kerr. No. 36596, Am. Mus., 2 ad., Slough, 
England. Left maxillary toothrow, direct crown view. For comparison with 
American types. 
Fig. 5.. Same specimen as Fig. 4. Oblique view of left maxillary toothrow. 
Fig. 6. Baiosciurus deppet matagalpe Allen. No. 29812, Am. Mus., o& ad., 
Pena Blanca, Nicaragua. Maxillary toothrows, direct crown view. 
Fig. 7. Same specimen as Fig. 6. Oblique view of left maxillary toothrow. 
Fig. 8. Echinosciurus aureogaster hypopyrrhus (Wagner). No. 17196. Am. 
Mus., 9 ad., Pasa Nueva, Vera Cruz, Mexico. Direct crown view of left maxillary 
toothrow. 7 
Fig. 9. Same specimen as Fig. 8. Oblique view of left maxillary toothrow. 
Fig. 10. Echinosciurus poliopus cervicalis (Allen). No. 26050, Am. Mus., 
o' ad., Volean de Fuego, Jalisco, Mexico. Direct crown view of left maxillary tooth- 
row. 
Fig. 11. Same specimen as Fig. 10. Oblique view of left maxillary toothrow. 
Fig. 12. Neosciurus carolinensis carolinensis (Gmelin). No. 2486, Am. Mus., 
9 ad., Hastings, Westchester Co., New York. Direct crown view of left maxillary 
toothrow. 
Fig. 18. Same specimen as Fig. 12. Oblique view of left maxillary toothrow. 
Fig. 14. Hesperosciurus griseus griseus (Ord). No. 11863, Am. Mus., & ad., 
Colusa Co., California. 
Fig. 15. Same specimen as Fig. 12. Oblique view of left maxillary toothrow. 
Fig. 16. Otosciurus aberti abertt (Woodhouse). No. 1686, Am. Mus., 9 ad., 
Mogollon Mts., Arizona. Direct crown view of left maxillary toothrow. 
Fig. 17. Parasciurus niger rufiventer (Geoffroy). No. 2508, Am. Mus., o’, 
Tangipaho Parish, Louisiana. Direct crown view of left maxillary toothrow. 
Fig. 18. Same specimen as Fig. 17. Oblique view of left maxillary toothrow. 
Fig. 19. Parasciurus arizonensis arizonensis (Coues). No. 1706, Am. Mus., 
@ ad., Fossil Creek, Arizona. Crown view of left maxillary toothrow. 
Fig. 20. Same specimen as Fig. 19. Oblique view of left maxillary toothrow. 
Fig. 21. Parasciurus apache (Allen). No. 21353. Am. Mus., 9 ad., Arroyo 
de Bucy, Durango, Mexico. Crown view of left-maxillary toothrow. 
Fig. 22. Same specimen as Fig. 21. Oblique view of left maxillary toothrow. 
‘Fig. 23. Parasciurus oculatus oculatus (Peters). No. 10886, Am. Mus., co’ ad., 
Las Vigas, Vera Cruz, Mexico. Left maxillary toothrow, direct crown view. 
- Fig. 24. Same specimen as Fig. 23. Oblique view of left maxillary toothrow. 
