g. Mustela frenata altifrontalis, ♂ ad., 391, Coll. Alex Walker, Blaine, Oregon.
h. Mustela frenata oregonensis, ♂ sad., 43828/32019, U. S. Nat. Mus., Grants Pass, Oregon.
i. Mustela frenata munda, ♂ ad., 5459, Mus. Comp. Zool., type, Point Reyes, California.
Plate 20. Photos, retouched, of skulls of males in ventral view of 9 subspecies of Mustela frenata, × 1. Data for a to i on Plates [18] and 21.
a. M. f. alleni
b. M. f. arizonensis
c. M. f. nevadensis
d. M. f. effera
e. M. f. washingtoni