The Johns Hopkins University Press. All rights reserved. This document may be used, with this header included, for noncommercial purposes within a subscribed institution . No copies of this work may be distributed electronically outside of the subscribed institution, in whole or in part, without written permission from the JHU Press . There are also small, isolated colonies in southwestern Texas and in northwestern Mexico in Coahuila and Tamaulipas.
Males are usually larger than females.
The color is blackish, grayish, brownish, or coppery. The fur is soft, dense, and velvety. The nose is a distinct snout with nostrils opening upward, and the eyes and ears are not evident externally. The palms of the hands are broader than they are long, and the fingers and toes have small areas of skin-covered tissue connecting them. The tail is less than a fourth of the total length, tapering, indistinctly annulated with scales, and nearly naked.