m the worn, drab-gray
pelage of winter to a brighter, more tawny summer pelage, but molt in a
few females, perhaps originally delayed by reproductive activity,
continues well into the summer months. Of seven specimens taken between
May 15 and 24, two (one male and one lactating female) were in an early
stage of molt, whereas the remainder were in winter pelage. Nine
specimens (four females and five males) taken in mid- and late June were
molting, but two females collected then were in winter pelage, and three
animals, two males and a female, had completed molt to summer pelage.
One adult female taken on August 5 had yet to complete molt to summer
pelage. In our material, the first indication of molt from winter to
summer pelage appears on the top of the head and the cheeks. Thereafter,
molt proceeds posteriorly over the shoulder region and more or less
evenly along the back and sides. In two specimens, small patches of molt
preceded the general molt line. Molt on the venter apparently begins
after molt on the dorsum approaches completion, but we could discern no
definite pattern; on four specimens, hair was being replaced on the
venter in scattered patches.

An August-taken young of the year engaged in post-juvenal molt had new
adult pelage in a vague hour-glass pattern in the dorsal trunk region as
well as on the cheeks and anterior part of the head. It was actively
molting on top of the head, between the ears, over the shoulders,
laterally behind the front feet, and along the sides, and had old pelage
on the rump. Ventrally, the new adult pelage was evident only along the
midline.

One adult male examined for ectoparasites harbored a tick, _Dermacentor
andersoni_ Stiles, and fleas, _Monopsyllus eumolpi_ Rothschild.

~Spermophilus tridecemlineatus pallidus~ J. A. Allen, 1874

Thirteen-lined Ground Squirrel

_Specimens examined_ (22).--2 mi. N, 5 mi. W Ludlow, 5; 19 mi. N, 1 mi.
E Camp Crook, 2; 2 mi. S, 2 mi. W Ladner, 1; 6-1/2 mi. N, 2 mi. W Camp
Crook, 1; 1/2 mi. W Reva, 3; 4 mi. S, 1/2 mi. W Reva, 1; 6 mi. W Reva,
7; 15 mi. S, 4 mi. W Reva, 1; 7 mi. S, 4-1/2 mi. E Harding, 1.

Ground squirrels are common in areas of short grass; we observed them
most frequently along roadways and fencerows in otherwise overgrazed
flats. Many of our specimens were shot or taken in break-back traps
baited with rolled oats in just such situations.

Young from the first litters of the year were above ground by late June
and re