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Show 1900.] MAMMALS FROM SIAM. 195 18. Mus CONCOLOR Blyth. Doi Sritepe, Chingmai. a-d. d- 3rd & 25th March and 30th April. 19. RHIZOMYS MINOR Gray. Nan. a. 2 » young but full-grown. 8th Aug., 1897. Dimensions: head and body 213 mm.; tail 50 ; hind foot 26; ear 10. b. 2 imm. sk. 18th Aug., 1897. Dimensions: head and body 160 mm.; tail 45 ; hind foot 25 ; ear 7. c. 2 imm. sk. 18th Sept., 1897. Dimensions: head and body 159 m m ; tail 52 ; hind foot 27 ; ear 8. I have examined two specimens, now in the Museum, with which the above-mentioned specimens closely agree. One of these two specimens must have been Gray's type. One was procured in Cochin China, and the other by Dr. Finlayson in Siam. They differ in the intensity of the umber-brown tips to the hairs, the Siamese specimen showing considerably more than that from Cochin China. None of Mr. Lyle's specimens are fully adult, and though they vary slightly among themselves, show, as might be expected, a much greater affinity to the Siamese specimen. Mr. Thomas notes1 that the bright colour is only assumed in adult individuals; and as Mr. Lyle's specimens are all young, I was at first inclined to regard R. minor as an immature R. baclius. The skull2, however, of the Cochin China specimen is fully adult and is much smaller than the type skull of R. baclius. The skull of Mr. Lyle's largest specimen, except in being that of a younger animal, agrees in all respects with the skull from Cochin China. R. minor is therefore a southern race of R. baclius inhabiting Siam and Cochin China, and is distinguishable chiefly by its smaller size and slightly duller colour. The measurements of Mr. Lyle's largest specimen given above represent the average size of this species. The measurements of R. baclius as given by Blanford are as follows :-Head and body 228 ram. ; tail 68 : hind foot 31. 20. MANIS JAVANICA Desm. Nan. a. Doi Sritepe, Chingmai. 6. 2 ad. sk. 23rd March, 1898. EXPLANATION OF PLATE XVIII. Petaurista lylei, sp. n., p. 192. 1 P.Z.S. 1886, p. 65. - Fig. in Anderson, Zool. Res. W . Yunnan, pi. xvi. |