External measurements include: _Total length_, from tip of nose to tip
of tail without hairs, measured before skinning; _tail vertebræ_, length
of tail from point in angle when tail is bent at right angles to body to
tip of tail without hairs; and _hind foot_, from heel to tip of longest
claw.

The following are measurements of a series from the U. S. Range Reserve:

[Transcriber note: Next line was corrected per erratum. The
original text was of the following paragraph (_Averages for 17
adult females: Total length, 326.4 millimeters_).]

Average measurements of 30 adult specimens of both sexes: Total length,
326.2 millimeters (349-310); tail vertebræ, 188.4 (208-180); hind foot,
49.5 (51-47); the average weight of 29 adult specimens of both sexes was
114.5 grams (131.9-98.0).

Averages for 17 adult females: Total length, 326.4 millimeters
(349-310); tail vertebræ, 188.8 (208-179); weight (16 individuals),
113.7 (131.9-98.0); excluding pregnant females, 13 individuals averaged
112.9 grams (131.9-98.0).

Averages for 13 adult males: Total length, 326 millimeters (345-311);
tail vertebræ, 187.8 (202-168); weight, 116.8 grams (129-100).

There appears to be no significant difference in the measurements and
weights of males and females, with the possible exception of the
comparison of adult males and adult nonpregnant females.