Fur dusky gray above with a tinge of yellow; beneath cinereous: ears about half the length of the head.

M. Musculus, Desm. Mammal, p. 301. Flem. Brit. An. p. 19. Common Mouse, Penn. Brit. Zool. vol. i. p. 122. pi. 11. no. 30. Shaw, Gen. Zool. vol. II. p. 56. pi. 131.


Length of the head and body three inches two lines; of the head eleven lines; of the ears five lines; of the tail two inches eleven lines.


Head of a somewhat triangular form; muzzle pointed, sharper than in the M. sylvaticus: eyes and ears, especially the former, smaller than in that species; the latter oval, rounded at the extremity, and narrower in proportion to their length: whiskers shorter: tail stouter : feet and toes, particularly those behind, shorter. All the upper parts of the body and sides, dusky gray with a faint tinge of yellow, this last colour occupying a small portion of each hair near the summit, the basal half and extreme tip being dusky; under parts cinereous, paler than those above, likewise tinged with yellow: ears, feet, and tail, clothed with a very short fine hair; the last dusky, of one colour above and below. - Obs. The colours vary a little in different specimens, and sometimes individuals occur wholly white ; or white with dark spots.

Found in houses and stacks. Those which occur in the latter situation are remarkable for the brightness of their colour, which has a more decided yellow tinge than in house specimens. They also sometimes attain a larger size, measuring nearly four inches in length. Feeds on various animal and vegetable substances. Breeds several times in the year, and is extremely prolific.