C. C. Black. 1963. A review of the North American Tertiary Sciuridae. Bulletin of the Museum of Comparative Zoology 130(3):109-248 [ER 4350]

Contributed by Benjamin Carter, entered by Benjamin Carter on 2025-02-28

Samples: none

Size measurements: Protospermophilus malheurensis (P4 length 2.00 mm), Protospermophilus malheurensis (P4 width 2.40 mm), Protospermophilus malheurensis (M1 length 2.40 mm), Protospermophilus malheurensis (M1 width 2.70 mm), Protospermophilus malheurensis (M2 length 2.40 mm), Protospermophilus malheurensis (M2 width 2.80 mm)