1900.] MAMMALS FBOM SIAM. 195 



18. Mus concoloe Blyth. 



Doi Sritepe, Chingmai. a-d. S - 3rd & 25th March and 

 30th April. 



19. Ehizomts minob Gray. 



]S r an. 



a. 2 » young but f all-grown. 8th Aug., 1897. Dimensions : head 

 and body 213 mm. ; tail 50 ; hind foot 26 ; ear 10. 



b. $ 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 mm ; tail 52 ; hind foot 27 ; ear 8. 



1 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 notes 1 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. badius. 



The skull 2 , however, of the Cochin China specimen is fully adult 

 and is much smaller than the type skull of R. badius. 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. badius 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 abow 

 represent the avei'age size of this species. 



The measurements of R. badius as given by Elaufcrd are as 

 follows : — Head and body 228 mm. ; tail 68 : hind foot 31. 



20. Manis j ataxic a Desm. 



Xan. a, 



Doi Sritepe, Chingmai. b. $ ad. sk. 23rd March, 1898. 



EXPLANATION OF PLATE XVIII. 

 Petaurista lylei, sp. n., p. 192. 



P.Z. S. 1886, p. 65. 



Fig. in Anderson, Zool. Res. W. Yunnan, pi. xvi. 



