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Show 402 MR. O. THOMAS ON MAMMALS FROM ECUADOR. [May 4, 30. CHOLOZPUS HOFFMANNI, Peters. A y oung skin and skeleton from Balzar, showing clearly the presence of only six cervical vertebrae, and six specimens from Sarayacu. There is also a skin from the latter place which appears to be referable to C. didactylus, Linn.; but, without seeing the skeleton, I hesitate to state for certain that the two species are found together in the same locality. One of the Sarayacu skulls shows scarcely a trace of the usual inflation of the pterygoids ; the absence of this inflation in certain species of the Three-toed Sloths caused Dr. Gray to separate the genus Arctopithecus from Bradypus1; but this instance of its absence among the Two-toed Sloths shows that it is not a character which can be relied upon for generic distinction. 31. BRADYPUS INFUSCATUS, Wagl. A series of seven specimens from Sarayacu, and one from Balzar. The specimens show well the extraordinary amount of variation that occurs among the Sloths, there being no two skulls or skins exactly alike. The Balzar specimen has the soft straight hair on the face extending on the head to a distance of 2\ inches from the tip of the nose ; no other specimen that I have seen has this hair extending more than to just above the eyes, a distance of about one inch. There is, however, nothing special about the skull of this specimen. 32. PRIODONTES MAXIMUS. Dasypus maximus, Kerr, Linn. Syst. Nat. p. 112, 17922. Dasypus giganteus, Et. Geoff. & Cuv., Cat. Mamm. Mus. d'Hist. Nat. p. 207, 1802. Dasypus gigas, Cuv. Regne Anim. i. p. 221, 1817. Two specimens from Sarayacu. 33. TATUSIA KAPPLERI, Krauss. Two specimens, Sarayacu. This species, like Pteronura sandbachii, was hitherto only known from the Surinam region. These two specimens, however, agree exactly with those which the British Museum received some years ago from Dr. Krauss himself, except that one of them has a fifth claw on the fore as well as on the hind feet. The genus Tatusia has normally the rudimentary bones of a fifth toe on the fore feet; so that the occasional development of a fifth claw was quite to be expected. 34. TATUSIA NOVEMCINCTA, Linn. Tatusia peba, Desm. One specimen from Sarayacu. 35. XENURUS LUGUBRIS, Gray. One specimen from Sarayacu. 1 P. Z. S. 1849, p. 69. 2 Cf. Ann. & Mag. N. H. ser. 5, iv. p. 396, 1879. |