1962. _Spermophilus spilosoma oricolus_ Alvarez, Univ.
Kansas Publ., Mus. Nat. Hist., 14:123, March 7, type from 1
mi. E La Pesca, Tamaulipas.
_Distribution in Tamaulipas._--Known only from the type
locality and from parts of the barrier beach, but possibly
occurs at other places in northeastern parts of state.
The 10 specimens from the type locality were trapped or shot on the
beach, which was covered by thick, low, scattered bushes and grass. Of
the many holes found there, some probably were used by ground squirrels
and others by crabs. A female, taken on July 7 with two young at a
place 33 miles south of Washington Beach, weighed 133 grams and had six
placental scars. This specimen (reported as _Spermophilus spilosoma
annectens_ by Selander _et al._, 1962:335) resembles others examined
from the barrier beach (see Alvarez, 1962:124) and is therefore
assigned to _S. s. oricolus_.
_Records of occurrence._--Specimens examined, 24: 33 mi. S
Washington Beach, 1; 88 mi. S, 10 mi. W Matamoros, 12; 89
mi. S, 10 mi. W Matamoros, 1; 1 mi. E La Pesca, 10.
=Spermophilus variegatus couchii= Baird