On the Qrouping of some South- American Muridse. 139 



IIa}>. ]\ralay reniiisula. Type-locality and also that of 

 A. grutei, Giay — ^Malacca. Good skulls cxaininod from 

 Mabck, Jalor {Robinson and Annandale), Malacca {Ca/i<or), 

 and Singapore {Uidley). 



Acanthion Jclossi^ sp. n. 



Size larger, well-developed skulls attaining a condylo- 

 incisive length of 140 mm. Nasals largo, their length more 

 than twice that of the comparatively short frontal suture. 

 Interorbital region broad, swollen, convex, with scarcely any 

 indication of a postorbital ])r()jection. 



Skull-measurements in table on p. 138. 



JIab. Southern Tenasserim and Southern Siam. Type 

 from Tenasserim Town, other specimens from Bankachon, 

 Tenasserim {Shortridge), S. Siam, 12° N., 9I.>° 50' E. (A". G. 

 Gairdner), and Klong-Yai, S.E. Siam [G. Boden K/oss). 



Tj/pe. Adult male. B.M. no. li. 12. 8. 223. Original 

 number 4905. Collected by G. 0. Shorfridge. Presented 

 to the National Collection by the Bombay Natural History 

 Society. 



This species is .distinguished from A. brachyurus by its 

 shorter frontals and longer nasals and the lesser development 

 of postorbital processes. 



I have named the species in honour of Mr. Kloss, who 

 noticed and drew my attention to its difference from 

 A. Irachyxirus, and himself collected the specimen from 

 S.E. Siam. 



Anderson's Hijstrix ynnnanensis has markedly shorter 

 nasals than any of the porcupines here referred to. 



The Chinese porcupine, Acanthioji suhcristatus, Swinh., has 

 a skull very like that of A, klossi, but its coloration appears 

 to be more as in A. bengalensis and hodgsoni. 



VII. — On the Grouping of the South- American Muridrc that 

 have been referred to Phyllotis, Euueomys, and Eligmo- 

 dontia. ^y Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



The South-American Muridse which have been referred at 

 various times by various authors to the genera mentioned in 

 the title, as also to Heithrodon and IJesperomya^ have liitherto 

 formed a very confused group, and I have thought it useful 

 to go over the Museum series of them, which includes types 



