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Show 1\IAl\IMALIA. uuable to satisfy myself whether they are varieties of Mus xanllwrltinus or not. Both of Mus canescens and of Mus xantlwrltinus, I have before me what I imagine to ue an adult and a young specimen. The adult and the young of M. xantltadtinus agree in being of a yellowish-brown colour, and in having the muzzle and tarsi deep yel!ow; both specimens of Mus canescens are of a gmy colour, with an indistinct yellow wash, the muzzle and tarsi being tinted with yellow, as in M. xanthodtinus. Besides this difference in tint, which, perhaps, is unimportant, M. canescens differs from M. :~:antlw1·hinus in having· the head larger, the tail rather longer, and the fur less soft. The specimens of this animal are both from Patagonia; one of the specimens of Mus xanthorltinus was brought by Mr. Darwin from Terra del Fuego ; and as the other formed part of Captain King's collection, it in all probability came fl'Om the same locality. As I only possess one skull, I cannot speak with certainty as regards the size of the head ; the difference, however, in the stuffed specimens is considerable, and it is strange that each of the pairs should agree so perfectly, supposing the difference to be the work of the stuffer's hands. 18. Mus LONGIPILis. PLATE XVI. Mus longipilis, ·waterh., Proceedings of the Zoological Society of London for February 1837, p. 16. JJ:l. supra obscure griseus, jlavo lavatus; subtlls gn'seus; pedibus fuscis, unguibus tongiusculis; auribus mediocribus; cauda corpore breviore, supd nignsceute, subt1ls jitScescente ; 1·/tiuario Sttb-p1·oducto : vel/ere longissimo, molli. DESCRIPTION.-Fur very soft and silky, and extremely long-the ordinary fur of the back measuring nearly three quarters of an inch, and the longer hairs one inch in length ; ears moderate; tail neady as long as the body; muzzle much pointed; general colour gray, washed with yellow, the under parts pale gray, or grayish white; feet brown ; ears and tail well clothed ; the hairs on the inner side of the ears are chiefly of a yellow colour, those on the upper surface of the tail are brown black, those on the under part are dirty white; the hairs of the back are deep gray at the base, broadly annulated with yellow nea1· the apex, and dusky at the apex; the longer hairs are grayish black; the hairs of the moustaches are dusky at the base, and whitish beyond that part; the claws are long, and but slightly curved ; the |