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By THIES MONTE L

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18. Tamias (Eutamias) Greatest length of skull 30mm 23 developed .................................................................................................................... 15 14. -Skull more massive; occipital region oval in posterior view; cheek teeth heavier and more expanded laterally (than in Leucocrossuromys) ........................................................................... (Cynomys) -Skull less massive; occipital region more elliptical; cheek teeth lighter and less expanded .............................................

Neosciurus) 26. -A perforation through nasal septum connecting left and right infraorbital foramina through rostrum; nasals projecting anterior to incisors; anteroposterior diameter of incisors exceeding their width; incisors relatively weak .............................................................................................. Heteromyidae ....... 27 -No perforation through nasal septum; nasals not projecting anterior to incisors; incisors strong and chisel-like, their width exceeding anteroposterior diameter .............................................................................................

56 -All molars with reentrant angles on both sides of approximately equal depth, lower molars with angles deeper on lingual side; molars rootless except in (Myodes); bullae various ............................................................................................. 57 56. -Upper incisors pointing downward .............................................. Phenacomys (Fig. 59) -Upper incisors recurved and pointing posteriorly ........................... Arborimus (Fig. 60) 57. -Molars rooted; posterior border of palate a thin-edged straight shelf, continuous from side to side between posterior molars; bullae without internal bony trabeculae .............................................................................................

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