American Weasels

arizonensis 14.2 23.3 26.0 14.3 8.9 3.1 5.7 5.2 5.5 4.0 2.2 13.5 12.1 9.7 13.7 22.4 25.6 13.7 8.3 3.2 5.4 4.9 5.1 4.0 2.1 14.0 11.4 9.8 14.5 22.9 26.3 14.1 8.4 3.2 5.8 5.5 5.5 4...

D Interorbital breadth E Orbitonasal length F Mastoid breadth G Zygomatic breadth H Length } J Breadth }Tympanic Bulla K Depth } L Length m1 M Lateral } N Medial }P4 P Breadth }...

Mustela erminea F. M. N. H. 18134 [M] ad. Aitkin, Minn. 40.3 14.1 12.7 F. M. N. H. 18135 [M] ad. Aitkin, Minn. 14.1 12.5 F. M. N. H. 18130 [M] ad. Aitkin, Minn. 40.7 15.0 12.2 F...

Depth of skull at anterior margin of basioccipital.--Measured from anterior end of ventral face of basioccipital, excluding median ridge, vertically to dorsal face of parietal e...

7.4 9.3 14.1 15.8 10.9 5.4 3.7 3.2 3.5 2.7 1.6 8.4 7.4 6.9 9.5 13.6 15.6 10.0 4.8 3.6 3.3 3.5 2.5 1.6 9.0 7.6 7.0 10.0 13.8 15.4 10.1 4.9 3.6 3.2 3.3 2.3 1.4 8.1 7.3 7.1 *10.8 1...

The average distance away from the central den which four weasels (sex unspecified) traveled in a single night at Ames, Iowa, was 312 feet; the maximum distance was 642 feet. Th...

Capitalized color terms, unless otherwise indicated, refer to Ridgway's (1912) _Color Standards and Color Nomenclature_. Some use is made of color terms taken from Oberthür and...

On July 1, 1917, in Clay County, Nebraska, a nest with four young was found (Swenk, 1926:321). On July 29, 1939, an adult and five young were plowed out of the ground in Allegan...

The underlying cause seems to be protective coloration. At any rate, weasels are always white in winter if they are from areas where snow lies on the ground all winter, every wi...

_Characters of the species._--Size small: Total length less than 250 in males and 225 in females; tail a fourth or less of length of head and body, and without a black pencil an...

Considerable information has been recorded concerning the food of _Mustela frenata_ and a little information is on record as to kinds of foods not taken that could have been tak...

An adult male, taken on July 15 at Miquihuana, Tamaulipas, is unique in several respects. The top of its head is black, rather than blackish, and this color extends posteriorly...

_Characters for ready recognition._--Differs from _M. f. altifrontalis_ in presence of frontonasal white patch, lighter color above (tone 2 to 3 of Raw Umber, pl. 301, rather th...

Many writers have commented on the yellowish color, sometimes with a greenish tinge, found on the fur of weasels in the white winter coat. The stain is more often found on the t...

_Skull and teeth._--Male (based on a referred specimen from Cerro San Felipe which certainly is nontypical): See measurements. As described in _Mustela frenata frenata_ except t...

Finally, the type specimen of _munda_ is a "runt," smaller than any other male seen. This specimen, purchased by E. A. and O. Bangs from C. A. Allen, who collected and sold spec...

_Skull and teeth._--Male (based on type specimen and no. 562): See measurements and plates 27-30; weight, not known; basilar length, 43.2 (40.8 and 45.5); zygomatic breadth more...

_Externals._--Longest facial vibrissae black and extending beyond posterior border of ear; carpal vibrissae wholly, or in part, black and extending as far as hypothenar pad; hai...

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...

Five specimens, nos. 147375, 147432, 147762, 148720 and 148721, U. S. Nat. Mus., including 3 skulls only from Beemer, Cuming County, Nebraska, are intergrades between _M. f. lon...

It is possibly significant that _Mustela africana_ is intermediate in several respects between _Lyncodon_ and typical _Mustela_. The median, longitudinal, abdominal band of the...

From _richardsonii_, _haidarum_ differs in that skull of the male is actually larger in its anterior part (breadth of rostrum, interorbital breadth and orbitonasal length) but a...

_Skull and teeth._--Male (based on six adults from Stanford Univ. and vicinity): See measurements and plates 22-24; weight (four adults), 5.4 (5.0-5.9) grams; basilar length, 47...

The winter pelage is brown in all specimens at most localities. The only white pelage seen was in each of three specimens from Glacier, Whatcom County, Washington. A fourth spec...

_Mustela africana_, all characters considered, is the most aberrant of the American weasels. That is to say, greater difference prevails between _M. africana_ and any other Amer...

Comparison of the skull of the male with that of _M. f. nicaraguae_ has been made in the account of that subspecies. The skull of the male as compared with that of _M. f. tropic...

_Remarks._--In view of the heretofore erroneous assignment of the type locality of _Mustela erminea audax_ to Greenland, pains were taken to verify the statement by Barrett-Hami...

_Mustela erminea arctica_, Ognev, The mammals of U.S.S.R. and adjacent countries, 3:31, 1935; Hall, Proc. California Acad. Sci, 23:559, August 22, 1944; Hall, Journ. Mamm., 26:1...

_M. f. neomexicana_ has a large geographic range. The old male from Liberal, Seward County, Kansas, extends the known range far to the northeast. Geographically, this occurrence...

Of the vertebrae, only the cervicals, of which there are 7, were found to be constant in number. In _M. erminea_, two of the seven individuals in which the anticlinal vertebra w...

Compared with the skull of _M. f. longicauda_, that of both sexes averages smaller in every measurement taken. Males of _nevadensis_, on the average, relative to the basilar len...

=Michigan.= _Isle Royal_: Tobin Harbor, 1[76]; Bell Isle, 1[76]; Washington Harbor, 3[76]. _Ontonagon County_: Ontonagon, 2 (1[76], 1[14]); T. 51N, R. 43W, S. 17, Porcupine Mts....

=Oregon= (by counties from west to east). _Jackson County_: Rustler Peak, Crater Nat. Forest, 1[46]; Siskiyou (probably south of), 2. _Klamath County_: 20 mi. W Crescent, 1[101]...

The skull (plates 24-26, 30) is complete and unbroken. Excepting right P2, which has been aborted or broken away, all the teeth are present. The skin is well made and in good co...

_Color._--Rarely a few white hairs anterior to each ear; posterior fifth of each upper lip white; top of head, posteriorly to slightly behind ears, black, grading into color of...

_Color._--Spot between eyes, band confluent with color of underparts, on each side of head extending anterodorsally anterior to each ear, posterior third of each upper lip, lowe...

1844A. The zoölogy of the voyage of H. M. S. Sulphur, under the command of Captain Sir Edward Belcher, R. N., C. B., F. R. G. S., etc., during the years 1836-42. Mammalia, pp. 9...

_Characters for ready recognition._--Differs from _M. f. noveboracensis_ and _M. f. primulina_ in that specimens of all ages have least width of color of underparts amounting to...

_Range._--Transition and higher life-zones of northeastern United States south to Connecticut, central Pennsylvania and extreme northeastern Ohio; in Quebec and Ontario westward...

From _alascensis_, _salva_ differs in that males have the preorbital region slightly wider in relation to the length of the tympanic bulla; also the braincase is smaller, actual...

This geographic variation, it should be remembered, is all within one species. It is the more significant still when we remember that the same correlation, with never an excepti...

For assistance with the illustrations I am indebted to the late Major Allan Brooks for Plate 1, to Mrs. Mary Blos for figures 25-31, to Miss Ann Murray for figures 11-13, to Mr....

The skull (plates 31-33) is complete and unbroken save for a small puncture in the right squamosal. The incisors above and below and M^2 and P^2 on each side are missing. Four c...

_Specimens examined._--Total number, 138, arranged alphabetically by provinces and states and further by districts or counties from north to south except as otherwise indicated....

The length of the hind foot averages less than the basal length in both males and females. The tail averages 52 per cent as long as the head and body in males and 51 per cent in...

=Colombia=: Páramo de Tama, 1[60]; Cincinnati, 3[9]; Valdiva, 3800 ft., 1; Medellín, 2; 7200 ft., Barro Blanco, 1[2]; Santa Elena, 9000 ft., 1[2]; Santa Elena, 1[2]; Sonson, 2 (...

=Virginia.= _Shenandoah County_: Toms Brook, 1. _Arlington County_: Arlington, 1; Ballston, 1; Alexandria, 1. _Fairfax County_: Falls Church, 3; Mt. Vernon, 2; no locality more...

The skull (plates 19-21, 30) lacks the middle part of each zygomatic arch. The teeth all are present although much worn, probably from gnawing at the trap which captured the ani...

_Mustela frenata primulina_ is closely related to _M. f. noveboracensis_, from which, on the average, it differs in the lighter color of the upper parts of the summer coat, in t...

Of the 21 specimens in winter pelage, 17 are white and four are brown. The brown winter coat is distinctly paler, with more of a smoky tinge, than the brown summer pelage. The l...

=Minnesota.= _Roseau County_: Cedarbend, 2[14]; Grimstad, 1[14]; America, 2 (1[14], 1[74]); Malung, 1[74]; Norland, 1[41]; Falun, 3 (1[14], 1[74], 1[41]); Palmville, 1[41]; Spru...

Audubon and Bachman in their "Quadrupeds of North America," which appeared in parts from 1845 to 1853, recognized 5 species. Actually they were dealing with only 3 taxonomically...

Criddle and Criddle (1925:146), quote a neighbor in the vicinity of Treesbank, Manitoba, as recording that on October 29, 1917, "A weasel last night made its way into our fowl-h...

_Characters for ready recognition._--Differs: From _M. f. olivacea_, in males, by width of tympanic bulla which is less than rather than more than 8.5 mm., and in adult females...

The weasel's agility and speed take it in and out of retreats, over obstacles and across open places in amazingly rapid fashion and are responsible for the animal's actions bein...

1903. =microtis= (_Putorius_) Allen [= _Mustela erminea richardsonii_], Bull. Amer. Mus. Nat. Hist., 19:563, October 10, 1903, is a name applied to an individual ermine of small...

Putorius, 76, 294, 300 aequatorialis, 75, 341, 387 affinis, 372, 375, 379, 384 agilis, 74, 222 alascensis, 75, 96, 131 allegheniensis, 77, 187 alleni, 76, 274 angustidens, 76, 1...

Mustela, 83 aequatorialis, 75 aestuarina, 82 affinis, 75, 375, 379, 384, 398, 409 africana, 73, 406, 409 agilis, 74, 393 alascensis, 75, 131 allegheniensis, 77, 187 alleni, 76,...