_Specimens examined_ (16).--2 mi. N, 5 mi. W Ludlow, 3; 4 mi. S, 7 mi. W
Ladner, 9; 10 mi. S, 5 mi. W Reva, 1; 14 mi. S, 4 mi. W Reva, 2; 15 mi.
S, 4 mi. W Reva, 1.
This pocket mouse is not uncommon in areas of short grass and sage in
Harding County. None of five adult females taken late in June was
pregnant or lactating, but three had enlarged mammae indicative of
reproductive activity earlier in the spring, to which young of various
sizes in our series also attest. Active molt was evident on adults taken
on June 19, 26, and 28.
Our specimens are intergrades between _Perognathus fasciatus fasciatus_
and the paler _P. f. olivaceogriseus_. Average external measurements of
seven adults (two males and five females) are: total length, 138.0
(130-150); length of tail, 65.3 (59-74); length of hind foot, 17.1
(15-18.5); length of ear (six specimens only), 6.8 (6-7); weight in
grams (five specimens only), 12.9 (11.2-14.6). Selected cranial
measurements of the two males and two of the females are, respectively,
as follows: occipitonasal length, 24.0, 23.2, 23.5, 22.3; interorbital
breadth, 4.9, 5.2, 5.0, 5.0; mastoid breadth, 13.0, 13.1, 12.2, 11.9;
length of maxillary toothrow, 3.3, 3.3, 3.1, 3.4.
~Perognathus hispidus paradoxus~ Merriam, 1889