Eight (one in alcohol) from Sirhassen and seven (one in alcohol) Pulo Laut. It is highly probable that these specimens represent a species distinct from the true _Pteropus hypomelanus_ of Ternate. NYCTICEBUS TARDIGRADUS (Linnæus). 1894. _Nycticebus tardigradus_ THOMAS and HARTERT, Novitates Zoologicæ, I, p. 655. September, 1894 (Bunguran). 1895. _Nycticebus tardigradus_ THOMAS and HARTERT, Novitates Zoologicæ, II, p. 489 (Bunguran). One specimen from Bunguran. MACACUS 'CYNOMOLGUS' Auct. 1894. _Macacus cynomolgus_ THOMAS and HARTERT, Novitates Zoologicæ, I, p. 654. September, 1894 (Bunguran). 1895. _Macacus cynomolgus_ THOMAS and HARTERT, Novitates Zoologicæ, II, p. 489. December, 1895 (Bunguran). A specimen from each of the following islands: Sirhassen, Pulo Lingung and Pulo Laut. SEMNOPITHECUS CRISTATUS (Raffles). Two monkeys from Sirhassen appear to be referable to this species. SEMNOPITHECUS NATUNÆ Thomas and Hartert. 1894. _Semnopithecus natunæ_ THOMAS and HARTERT, Novitates Zoologicæ, I, p. 652. September, 1894 (Bunguran). 1895. _Semnopithecus natunæ_ THOMAS and HARTERT, Novitates Zoologicæ, II, p. 489. (Bunguran.) Ten specimens from Bunguran. FOOTNOTES: [1] For location of the Natuna Islands see Proc. Washington Acad. Sci., II, p. 204. August 20, 1900. [2] Thomas (O.) and Hartert (E.). List of the first collection of mammals from the Natuna Islands. Novitates Zoologicæ, I, pp. 652-660. September, 1894. Thomas (O.). Revised determinations of three of the Natuna rodents. Novitates Zoologicæ, II, pp. 26-28. February, 1895. Thomas (O.) and Hartert (E.). On a second collection of mammals from the Natuna Islands. Novitates Zoologicæ, II, pp. 489-492. December, 1895. Bonhote (J. Lewis). On the squirrels of the Ratufa (Sciurus) bicolor group. Ann. and Mag. Nat. Hist., 7th ser., V, pp. 490-499. June, 1900. Thomas (O.). The red flying squirrel of the Natuna Islands. Novitates Zoologicæ, VII, p. 592. December 8, 1900. Bonhote (J. Lewis). On the Squirrels of the Sciurus Prevostii Group. Ann. and Mag. Nat. Hist., 7th ser., VII, pp. 167-177. February, 1901. [3] Gray's "Notice of a species of Tupaia from Borneo, in the collection of the British Museum" in the Proceedings of the Zoological Society of London for 1865 (p. 322) may be added to the bibliography of Natuna mammals, as the animal described, though supposed to have been taken in Borneo, is apparently confined to Bunguran Island, the largest of the Natunas. [4] _Megaderma spasma_, _Myotis muricola_, _Taphozous melanopogon_, _Mydaus meliceps_, _Paradoxurus hermaphroditus_, _Lutra sumatrana_ and _Mus ephippium_. [5] See papers already cited, also Novitates Zoologicæ, I, p. 468 (letter from Mr. Everett); _ibid._, I, p. 483 (note on land shells by Mr. E. Smith), _ibid._, II, p. 478 (Birds); _ibid._, II, p. 499 (Reptiles). [6] Sitz.-Berich. der Gesellsch. Naturforschender Freunde zu Berlin, 1893, p. 224.