in
millimeters are as follows: young male 582; adult males 640, 655; young
females 460, 520; adult female 630. The color and condition of the
pelage is the same in all the specimens except that the two largest
males are much more worn and show irregular patches of new hair on the
back, and the two young females are paler especially on the back and
tail. These marmots were taken at localities 4, 7, 8, 10, and 16.

=_Spermophilus lateralis lateralis_= (Say).--Eleven specimens of the
Golden-mantled Ground Squirrel (59748-59756, 59763-59764) were taken at
localities 1, 3, and 4. Young were born before late June; three young
of the year were taken at locality 3 on June 29 and 30, and none of the
adult females taken at locality 1 (1 female) and at locality 4 (3
females) was pregnant. Most adults of both sexes at all elevations
represented (6800 to 10,200 ft.) showed molt in progress and proceeding
from anterior to posterior. All specimens were obtained from June 25 to
July 4.

=_Spermophilus variegatus grammurus_= (Say).--Three Rock Squirrels
(59738-59739, 59742) were obtained at locality 3. One of these
specimens was a skull found near a wood rat nest. The other two were
nonpregnant females; the adult measured 485 millimeters in total
length, and the younger individual measured 413 millimeters. The two
skins are characteristic of _S. v. grammurus_ in their paleness.

=_Eutamias minimus consobrinus_= (J. A. Allen).--The 63 specimens of
the Least Chipmunk (59770-59824, 60105-60108, 70024-70025, and nos.
5194 and 5196 in Univ. of Colorado Museum) were taken at localities 2,
3, 4, 6, 7, 8, 10, 13, and 15. The reproductive condition at time of
death had been noted for 20 females obtained from June 17 to July 2 at
elevations from 9500 to 10,400 feet. Eleven of these had no embryos,
but six have mammae that are still prominent on the dried skins and may
have had litters prior to their capture. Nine females contained
embryos, numbering 3 in two specimens, 5 in four specimens, 6 in two
specimens, and 7 in one specimen.

=_Eutamias quadrivittatus hopiensis_= Merriam.--Four specimens of the
Colorado Chipmunk were obtained by D. A. Sutton at locality 2, at 6800,
6900, 7175, and 8050 feet elevation. All are males taken on May 13 and
14, 1949; the specimens bear numbers 5197, 5198, 5199, and 5201 in the
collection of the University of Colorado Museum.

=_Thomomys talpoides fossor_= J. A. Allen.--The 27 specimens of the
Northern Pock