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Diagnostic dental characters include: 3rd upper unicuspid smaller than 4th, and unicuspids, except 5th, with a pigmented ridge extending from near apex of each tooth medially to cingulum and sometimes ending as internal cusplet.

That this character does not obtain universally within the group is demonstrated by the unicuspid structure of the talonid of m3 of the majority of the species of Mexican Cryptotis.