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Show 1868.] DR. j. E. G R A Y O N SACCOMYIN.E. 205 formed of numerous slender channelled spines, ending in a long bristle, and intermixed with elongated slender hairs Hab. Mexico (Salle). The fur of this species is softer than that of H. melanoleucus, and not so soft as that of H. irroratus. The tail is much larger than either. There is no indication of any yellow streak on the side, between the colours of the back and under surface. 5. HETEROMYS IRRORATUS. Fur rigid, grey, black, and yellow mixed ; under surface of the nose, the upper lip, the lower part of the cheek-pouches, chin, and under surface of the body, the inner side of the limbs, and the under surface of the tail white; sides with a widish interrupted yellow line between the dark and white colour; upper surface of the feet whitish; tail almost as long as the body, and head closely covered with short hairs. Perognathus fasciatus, Salle. Hab. Mexico, State of Oaxaca (SalU). This species agrees with the description of H. fasciatus, but the upper cutting-teeth are smooth. It is easily known from the preceding by the shortness and hairiness of the tail, and by the yellow streak on the side between the dark colour of the back and the white of the underside. 6. HETEROMYS ALBOLIMBATUS. B.M. Fur soft, smooth, grey, black, and very slightly yellow-varied; underpart of the nose, edge of the ears, lips, lower part of the cheek-pouches, underside of the body and inner side of the limbs, upper surface of the feet, and lowerside of the tail white. Fur soft, smooth ; hairs lanceolate, soft, channelled above, ending in a bristle-like tip, with abundance of elongated very slender yellow hairs ; tail as long as the body, slender, with rings of square scales and short black hairs, which are more abundant on the upper part near and at the tip, forming a kind of pencil. Var. Tail white at the tip. Hab. Mexico? La Parda (Feirecier). This species is known from the others by the greater softness of the fur, the greater slendernes of the hair, and the abundance of the elongated under-fur, and the distinct white edges to the ears. 6. SACCOMYS, F. CUV. Me'm. du Mus. x. 419, 1823. Upper and lower cutting-teeth smooth in front; grinders rooted, £| each formed of two cross ridges, the first one of each jaw longer, with longer tubercles, the outer edge of the front tubercle of the second and third tooth broader, with a fold. Fur soft, abundant, without any spines, less dense beneath and on limbs. Ears large, naked, with well-marked lobules. Hind foot rather large, long ; soles bald; toes 5.5; underside with cross bands. Tail slender, |