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_Transmitted May 22, 1950_.
[Illustration: PLATE 2. Photographs, retouched, of skulls in dorsal
view of nine subspecies of _Mustela erminea_. Natural size.
_a._ _Mustela erminea arctica_, [M] ad., 178405, U. S. Nat. Mus.,
Tanana, Alaska.
_b._ _Mustela erminea semplei_, [M] sad., 6499, Carnegie Mus.,
Southhampton Island.
_c._ _Mustela erminea kadiacensis_, [M] ad., 107496, U. S. N. M.,
Kodiak Island, Alaska.
_d._ _Mustela erminea richardsonii_, [M] ad., 133847, U. S. N. M., Ft.
Franklin, MacK.
_e._ _Mustela erminea cicognanii_, [M] ad., 53788, Mus. Vert. Zoöl.,
Lopez, Pennsylvania.
_f._ _Mustela erminea bangsi_, [M] ad., 18130, Field Mus. Nat. Hist.,
Aitkin, Minn.
_g._ _Mustela erminea invicta_, [M] ad., 90759, Mus. Vert. Zoöl., Pilot
Creek, Idaho.
_h._ _Mustela erminea alascensis_, [M] ad., 74665, Mus. Vert. Zoöl.,
Windham, Alaska.
_i._ _Mustela erminea salva_, [M] ad., 74641, M. V. Z., Mole Harbor,
Admiralty Id., Alaska.]
[Illustration: PLATE 3. Photographs, retouched, of skulls in ventral
view of nine subspecies of _Mustela erminea_. Natural size.
_a._ _Mustela erminea arctica_, [M] ad., 178405, U. S. Nat. Mus.,
Tanana, Alaska.
_b._ _Mustela erminea semplei_, [M] sad., 6499, Carnegie Mus.,
Southampton Island.
_c._ _Mustela erminea kadiacensis_, [M] ad., 107496, U. S. N. M.,
Kodiak Island, Alaska.
_d._ _Mustela erminea richardsonii_, [M] ad., 133847, U. S. N. M., Ft.
Franklin, MacK.
_e._ _Mustela erminea cicognanii_, [M] ad., 53788, Mus. Vert. Zoöl.,
Lopez, Pennsylvania.
_f._ _Mustela erminea bangsi_, [M] ad., 18130, Field Mus. Nat. Hist.,
Aitkin, Minn.
_g._ _Mustela erminea invicta_, [M] ad., 90759, Mus. Vert. Zoöl., Pilot
Creek, Idaho.
_h._ _Mustela erminea alascensis_, [M] ad., 74665, Mus. Vert. Zoöl.,
Windham, Alaska.
_i._ _Mustela erminea salva_, [M] ad., 74641, M. V. Z., Mole Harbor,
Admiralty Id., Alaska.]
[Illustration: PLATE 4. Photographs, retouched, of skulls in lateral
view of ten subspecies _Mustela erminea_. Natural size.
_a._ _Mustela erminea arctica_, [M] ad., 178405, U. S. Nat. Mus.,
Tanana, Alaska.
_b._ _Mustela erminea semplei_, [M] sad., 6499, Carnegie Mus.,
Southampton Island.
_c._ _Mustela erminea kadiacensis_, [M] ad., 107496, U. S. N. M.,
Kodiak Island, Alaska.
_d._ _Mustela erminea richardsonii_, [M] ad., 133847, U. S. N. M., Ft.
Franklin, MacK.
_e._ _Mustela erminea cicognanii_, [M] ad., 53788, Mus. Vert. Zoöl.,
Lopez, Pennsylvania.
_f._ _Mustela erminea bangsi_, [M] ad., 18130, Field Mus. Nat. Hist.,
Aitkin, Minn.
_g._ _Mustela erminea invicta_, [M] ad., 90759, Mus. Vert. Zoöl., Pilot
Creek, Idaho.
_h._ _Mustela erminea alascensis_, [M] ad., 74665, Mus. Vert. Zoöl.,
Windham, Alaska.
_i._ _Mustela erminea salva_, [M] ad., 74641, M. V. Z., Mole Harbor,
Admiralty Id., Alaska.
_j._ _Mustela erminea initis_, [M] ad., 289, Mus. Vert. Zoöl., Saook
Bay, Alaska.]
[Illustration: PLATE 5. Photos, retouched, of skulls of 9 subspecies of
_Mustela erminea_, × 1.
_a._ _Mustela erminea initis_, [M] ad., 289, Mus. Vert. Zoöl., Saook
Bay, Alaska.
_b._ _Mustela erminea celenda_, [M] ad., 1053, Los Angeles Mus., Craig,
Alaska.
_c._ _Mustela erminea seclusa_, [M] ad., 31232, M. V. Z., Port Santa
Cruz, Alaska.
_d._ _Mustela erminea haidarum_, [M] ad., 230777, U. S. N. M., Graham
Island, B. C.
_e._ _Mustela erminea anguinae_, [M] ad., 13508, Nat. Mus. Canada, Cape
Scott, V. I., B. C.
_f._ _Mustela erminea fallenda_, [M] ad., 7096, Nat. Mus. Canada,
Huntingdon, B. C.
_g._ _Mustela e. olympica_, [M] ad., 90738, U. S. N. M., near head of
Soleduc Riv., Wash.
_h._ _Mustela erminea streatori_, [M] ad., 133, Coll. of Alex Walker,
Blaine, Oregon.
_i._ _Mustela erminea gulosa_, [M] ad., 82177, U. S. Nat. Mus., Trout
Lake, Wash.]
[Illustration: PLATE 6. Photos, retouched, of skulls of 9 subspecies of
_Mustela erminea_, × 1.
_a._ _Mustela erminea initis_, [M] ad., 289, Mus. Vert. Zoöl., Saook
Bay, Alaska.
_b._ _Mustela erminea celenda_, [M] ad., 1053, Los Angeles Mus., Craig,
Alaska.
_c._ _Mustela erminea seclusa_, [M] ad., 31232, M. V. Z., Port Santa
Cruz, Alaska.
_d._ _Mustela erminea haidarum_, [M] ad., 230777, U. S. N. M., Graham
Island, B. C.
_e._ _Mustela erminea anguinae_, [M] ad., 13508, Nat. Mus. Canada, Cape
Scott, V. I., B. C.
_f._ _Mustela erminea fallenda_, [M] ad., 7096, Nat. Mus. Canada,
Huntingdon, B. C.
_g._ _Mustela e. olympica_, [M] ad., 90738, U. S. N. M., near head of
Soleduc Riv., Wash.
_h._ _Mustela erminea streatori_, [M] ad., 133, Coll. of Alex Walker,
Blaine, Oregon.
_i._ _Mustela erminea gulosa_, [M] ad., 82177, U. S. Nat. Mus., Trout
Lake, Wash.]
[Illustration: PLATE 7. Photos, retouched, of skulls, of subspecies of
_Mustela erminea_. Natural size.
_a._ _Mustela erminea celenda_, [M] ad., 1053, Los Angeles Mus., Craig,
Alaska.
_b._ _Mustela erminea seclusa_, [M] ad., 31232, M. V. Z., Port Santa
Cruz, Alaska.
_c._ _Mustela erminea haidarum_, [M] ad., 230777, U. S. N. M., Graham
Island, B. C.
_d._ _Mustela erminea anguinae_, [M] ad., 13508, Nat. Mus. Canada, Cape
Scott, V. I., B. C.
_e._ _Mustela erminea fallenda_, [M] ad., 7096, Nat. Mus. Canada,
Huntingdon, B. C.
_f._ _Mustela erminea olympica_, [M] ad., 90738, U. S. N. M., near head
of Soleduc Riv., Wash.
_g._ _Mustela erminea streatori_, [M] ad., 133, Coll. of Alex Walker,
Blaine, Oregon.
_h._ _Mustela erminea gulosa_, [M] ad., 82177, U. S. Nat. Mus., Trout
Lake, Wash.
_i_, _j_, _k_. _Mustela erminea muricus_, [M] ad., 41501, M. V. Z.,
Baker Creek, 8675 ft., Nev.
_l_, _m_. _Mustela erminea angustidens_, [M]?, sad., 12437, A. M. N.
H., Conard Fissure, Ark.
_n._ _Mustela erminea angustidens_, [M]?, ad., 12441, A. M. N. H.,
Conard Fissure, Ark.]
[Illustration: PLATE 8. Photos, retouched, of _Mustela erminea
angustidens_. All in Amer. Mus. Nat. Hist., from Conard Fissure,
Arkansas. Pleistocene in age, × 1.
_a._ Adult, probably male, 12441.
_b._ Subadult, probably male, 12437.
_c._ Adult, probably male, 12444.
_d._ Adult, probably male, 12441.
_e._ Subadult, probably male, 12437.
_f._ Young, probably male, 12438.
_g_, _h_. Adult, type, probably female, 12432.
_i._ Adult, probably female, 12433.]
[Illustration: PLATE 9. Photographs, retouched, of skulls in dorsal
view of 9 subspecies of _Mustela erminea_. Natural size.
_a._ _Mustela erminea arctica_, [F] ad., 35895, Field Mus. Nat. Hist.,
Point Barrow, Alaska.
_b._ _Mustela erminea semplei_, [F] ad., 6600, Carnegie Mus.,
Southhampton Island.
_c._ _Mustela erminea kadiacensis_, [F] ad., 98042, U. S. Nat. Mus.,
Kadiak, Alaska.
_d._ _Mustela erminea richardsonii_, [F] ad., 129703, U. S. N. M., Fort
Resolution, MacK.
_e._ _Mustela erminea cicognanii_, [F] ad., 7460, Carnegie Mus.,
Pymatuning Swamp, Pa.
_f._ _Mustela erminea bangsi_, [F] ad., 8679, Univ. Wisconsin, T. 61N,
R. 26W, Minn.
_g._ _Mustela erminea invicta_, [F] ad., 90820, M. V. Z., 1-1/2 mi. W
Iron Mtn., Idaho.
_h._ _Mustela erminea alascensis_, [F] ad., 74422, U. S. Nat. Mus.,
Juneau, Alaska.
_i._ _Mustela erminea salva_, [F] ad., 74655, Mus. Vert. Zoöl., Mole
Harbor, Alaska.]
[Illustration: PLATE 10. Photographs, retouched, of skulls in dorsal
view of 9 subspecies of _Mustela erminea_. Natural size.
_a._ _Mustela erminea arctica_, [F] ad., 35895, Field Mus. Nat. Hist.,
Point Barrow, Alaska.
_b._ _Mustela erminea semplei_, [F] ad., 6600, Carnegie Mus.,
Southhampton Island.
_c._ _Mustela erminea kadiacensis_, [F] ad., 98042, U. S. Nat. Mus.,
Kadiak, Alaska.