Mustela erminea richardsonii Bonaparte
Ermine
Plates [2], [3], [4], [9], [10] and [11]
Mustela richardsonii Bonaparte, Charlesworth's Mag. Nat. Hist., 2:38, 1838.
Putorius cicognanii, Baird, Mamm. N. Amer., p. 161, 1858 (part).
Putorius richardsonii, Baird, Mamm. N. Amer., p. 164, 1858 (part-Halifax, N. S.).
Putorius (Gale) erminea, Coues, Fur-bearing animals, p. 109, 1877 (part).
Putorius richardsoni, Bangs, Proc. Biol. Soc. Washington, 10:16, February 25, 1896.
Putorius cicognani richardsoni, Merriam, N. Amer. Fauna, 11:11, June 30, 1896.
Putorius (Arctogale) cicognanii cicognanii, Bangs, Proc. New England Zoöl. Club, 1:18, February 28, 1899.
Putorius microtis Allen, Bull. Amer. Mus. Nat. Hist., 19:563, October 10, 1903. Type from Shesley, British Columbia.
Putorius arcticus imperii Barrett-Hamilton, Ann. and Mag. Nat. Hist., 13(ser. 7):392, May, 1904. Type from Fort Simpson, Mackenzie, Canada.
Putorius cicognanii richardsoni, Preble, N. Amer. Fauna, 27:231, October 26, 1908.
Mustela microtis, Miller, U. S. Nat. Mus. Bull., 79:96, December 31, 1912.
Mustela cicognanii mortigena Bangs, Bull. Mus. Comp. Zoöl., 54:511, July, 1913. Type from Bay St. George, Newfoundland.
Mustela cicognanii, Sheldon, Journ. Mamm., 13:201, August 9, 1932.
Mustela cicognanii richardsonii, Miller, U. S. Nat. Mus. Bull., 79:95, December 31, 1912; Hall, Univ. California Publ. Zoöl., 40:368, November 5, 1934.
Mustela cicognanii cicognanii, Hall, Canadian Field-Nat., 52:108, October, 1938.
Mustela erminea richardsonii, Hall, Journ. Mamm., 26:77, February 27, 1945; Hall, Journ. Mamm., 26:180, July 19, 1945.
Type.—Male, age unknown, skin; no. 43.3.3.4, British Museum of Natural History; probably from Fort Franklin, Canada; presented to British Museum on or before March 3, 1843; may be the type.
In September, 1937, when I searched in the British Museum for the skull, I found no trace of it nor mention of it in catalogues. The skin is in white, winter pelage, mounted on a pedestal. See under remarks for Mustela e. cicognanii for reasons for and reasons against regarding this specimen as the holotype.
Range.—Hudsonian and Canadian life-zones of the greater part of Canada from the Atlantic to the Pacific. See figure [25] on page [95].
Characters for ready recognition.—Differs from M. e. arctica, polaris, semplei and haidarum, in both sexes, by proximal two-thirds of under side of tail colored same as upper parts rather than same as underparts, and interorbital breadth less, rather than not less, than distance between glenoid fossa and posterior border of external auditory meatus; from M. e. bangsi, in that, in both sexes, least width of color of underparts averages two-fifths rather than about a third of greatest width of color of upper parts, and in that skulls of males are a fourth heavier, basilar length averaging more than 40; from M. e. cicognanii, in both sexes, in that least width of color of underparts averages two-fifths instead of less than a third of greatest width of color of upper parts, in females by 20 per cent heavier skull (1.1 versus 0.92), in males by skull more, rather than less, than 1.9 grams, and basilar length more, instead of less, than 38; from M. e. invicta, in males, by skull more, instead of less, than 1.9 grams; mastoid breadth more, instead of less, than 19.9 mm.; depth of skull at anterior margin of braincase more, instead of less, than 12.4 mm.; in females, by same measurement of depth more, instead of less, than 10.1, and weight of skull averaging more, instead of less, than one gram; from M. e. fallenda in both sexes upper lips white rather than brown, in males, hind foot more than 41, basilar length more than 38.3, in females hind foot more than 29, basilar length more than 31.4, and breadth of rostrum amounting to less, instead of more, than 30 per cent of basilar length; from M. e. alascensis in males in that black tip of tail more than 43, total length more than 320, tympanic bullae more than 14 and longer than tooth-row rather than less than 14 mm. and sometimes shorter than tooth-row, females not individually distinguishable.
Description.—Size.—Male: Four adults (Fort Franklin, Fort Simpson, Mts. W Fort Nelson, and Govt. Hay Camp, Wood Buffalo Park) yield average and respective measurements as follows: Total length, 331 average (340, 325, 330, 328); length of tail, 93 (102, 91, 93, 87); length of hind foot, 45 (48, 43, 45, 44). Weight of 4 adults from the Belcher Islands is 175 (135-180) grams. Of 10 subadults from Belcher Islands it is 119 (92-137) grams.
Female: Three adults from Great Slave Lake (Willow River, Fairchild Point, and Fort Resolution) yield average and respective measurements as follows: Total length, 252 (237, 238, 282); length of tail, 69 (63, 60, 85); length of hind foot, 32 (31, 32, 34). Corresponding, average measurements for three adults from Glacier Lake are 240, 60, 32 and for 3 adults from the Athabasca Delta, 243, 65, 30. Weight of 8 subadults from the Belcher Islands is 69 (64-78) grams. Weight of adults would be more.
Color.—Winter pelage all white except tip of tail. Summer pelage with upper parts uniform in color and darker (16n) than Raw Umber, and about tones 3 to 4 of Chocolate of Oberthür and Dauthenay, pl. 343. Underparts Sulphur Yellow, Colonial Buff, or Primrose Yellow, often nearly white on chin and insides of forelegs; color of underparts extends narrowly over upper lips, distally on posterior sides of forelegs onto antipalmar faces of toes and sometimes over most of antipalmar surfaces of forefeet, on medial sides of hind legs to a point between knee and ankle but reappears on antiplantar faces of toes and in some individuals is narrowly continuous onto toes. Least width of color of underparts averaging, in a series of 12 males from the Athabasca Lake Region, 40 (25-54) per cent of greatest width of color of upper parts. Black tip of tail averaging 56 (45-63) mm. in 5 adult males from same region and thus 60 (48-70) per cent of length of tail-vertebrae.
From arctica, polaris, semplei and kadiacensis, richardsonii differs in: Color darker; ventral side of tail same color as upper parts; light-colored underparts a fifth narrower; black tip of tail by actual measurement a fifth shorter and averaging less than two-thirds rather than more than four-fifths of length of tail-vertebrae. From cicognanii, richardsonii differs in that the underparts are a fourth wider and in some specimens more brightly colored. The width of the underparts is likewise a fourth more than in bangsi. In invicta the underparts are not so brightly colored as in some specimens of richardsonii. From fallenda, richardsonii differs in that the upper parts often are lighter colored, upper lips white rather than colored like upper parts, and underparts as wide again. In comparison with alascensis, the black tip of the tail averages three-fifths rather than a half of length of tail-vertebrae.
Skull.—Male (based on 6 adults from 3 miles south of Big Island, Great Slave Lake): See measurements and plates [2]-[4]; weight, 2.5 (2.1-2.9) grams; basilar length, 40.9 (39.6-43.7); length of tooth-rows less than length of tympanic bulla; breadth of rostrum measured across lacrimal processes less than a third of basilar length; interorbital breadth less than distance between glenoid fossa and posterior border of external auditory meatus; zygomatic breadth less than distance between last upper molar and jugular foramen.
Female (based on 4 adults: from Willow River, 1; Fort Resolution, 1; Athabasca Delta, 2; and 2 subadults, one from 3 mi. S Big Island and one from 15 mi. above Smith Landing): See measurements and plates [9]-[11]; weight, 1.1 (0.9-1.4) grams; basilar length, 33.1 (31.5-34.2); length of tooth-rows less than length of tympanic bulla; breadth of rostrum less than 30 per cent of basilar length; interorbital breadth less than distance between glenoid fossa and posterior border of external auditory meatus; zygomatic breadth less than distance between last upper molar and jugular foramen.
The skull of the female averages 56 per cent lighter than that of the male.
Comparison of the skull with that of arctica, polaris, semplei, kadiacensis, haidarum, cicognanii, bangsi, invicta, fallenda, and alascensis is made in the accounts of those subspecies.
Remarks.—M. e. richardsonii has the most extensive geographic range of any American race of erminea, is centrally located with respect to the other races, is more abundantly represented by study specimens in zoölogical collections than any other race, and is a sort of average for the species as a whole in most structural features. Therefore richardsonii is used as a standard of comparison and accordingly is more fully described than any one of the other races each of which by reference to richardsonii is described in comparative fashion. This comparative description has the virtue of more clearly indicating differences between subspecies and also makes for brevity.
John Richardson, Bernard R. Ross, and names of their companions, as written on the labels of the older specimens recall to the student's mind early explorations of the north country. Edward A. Preble obtained important specimens at several places and in recent years J. Kenneth Doutt and G. G. Goodwin have made the reviser's work easier by preparing specimens in series from areas not previously well represented.
The nomenclatural history of this subspecies begins with references in the literature that identify the animal as the Old World species, Mustela erminea—an identification which the study here reported upon shows to have been correct in the specific, although not in the subspecific, sense. Richardson, for example, in his "Fauna Boreali-Americana" published in 1829 so identified the animal. In 1838, Bonaparte, basing his description on Richardson's account of 1829, proposed the new name richardsonii. Richardson himself, the following year in the "Zoology of Beechey's Voyage," accepted Bonaparte's name and it has been applied to the animal in the central part of the northern timber-belt of North America ever since, except as authors used the name Mustela erminea in the belief that richardsonii was not distinct from erminea.