i. Mustela frenata oribasus, ♂ ad., 43817, Mus. Vert. Zoöl., Isaacs Lake, B. C.
j. Mustela frenata alleni, ♂ ad., 7440/9136, A. M. N. H., Hill City, S. D.
Plate 19. Photographs, retouched, of skulls in dorsal view of nine subspecies of Mustela frenata. Natural size.
a. Mustela frenata alleni, ♂ ad., 7440/9136, Amer. Mus. Nat. Hist., Hill City, South Dakota.
b. Mustela frenata arizonensis, ♂ ad., 55211, Mus. Vert. Zoöl., Government Prairie, Arizona.
c. Mustela frenata nevadensis, ♂ ad., 22116, Mus. Vert. Zoöl., Chinquapin, California.
d. Mustela frenata effera, ♂ ad., 33637, Amer. Mus. Nat. Hist., Ironside, Oregon.
e. Mustela frenata washingtoni, ♂ ad., 226758, U. S. Nat. Mus., Gotchen Creek, Washington.
f. Mustela frenata saturata, ♂ ad., 65930, U. S. Nat. Mus., type, Siskiyou, Oregon.