i. Mustela erminea salva, ♂ ad., 74641, M. V. Z., Mole Harbor, Admiralty Id., Alaska.
Plate 3. Photographs, retouched, of skulls in ventral view of nine subspecies of Mustela erminea. Natural size.
a. Mustela erminea arctica, ♂ ad., 178405, U. S. Nat. Mus., Tanana, Alaska.
b. Mustela erminea semplei, ♂ sad., 6499, Carnegie Mus., Southampton Island.
c. Mustela erminea kadiacensis, ♂ ad., 107496, U. S. N. M., Kodiak Island, Alaska.
d. Mustela erminea richardsonii, ♂ ad., 133847, U. S. N. M., Ft. Franklin, MacK.
e. Mustela erminea cicognanii, ♂ ad., 53788, Mus. Vert. Zoöl., Lopez, Pennsylvania.
f. Mustela erminea bangsi, ♂ ad., 18130, Field Mus. Nat. Hist., Aitkin, Minn.
g. Mustela erminea invicta, ♂ ad., 90759, Mus. Vert. Zoöl., Pilot Creek, Idaho.