On the Grouping of some South- American Muridse. 139 



Hah. Malay Peninsula. Type-locality and also that of 

 A. grotei, Gray — Malacca. Good skulls examined from 

 Mabek, Jalor [Robinson and Annandale) , M.?)\i\.Q,Q.^ [Cantor], 

 and Singapore [Bidley). 



Acanthion Jclossiy sp. n. 



Size larger, well-developed skulls attaining a condylo- 

 incisive lengtli of 140 mm. Nasals large, their length more 

 than twice that of the comparatively short frontal suture. 

 Interorbital region broad, swollen, convex, with scarcely any 

 indication of a postorbital projection. 



Skull-measurements in table on p. 138. 



JJab. Southern Tenasserim and Southern Siam. Type 

 from Tenasserim Town, other specimens from Bankachon, 

 Tenasserim [Shoriridge] , S. Siam, 12° N., 99° 50' E. {K. G. 

 Gairdner), and Klong-Yai, S.E. Siam [G, Boden Kloss). 



Type. Adult male. B.M. no. 14. 12. 8. 223. Original 

 number 4905. Collected by G. C. Shortridge. Presented 

 to tlie National Collection by the Bombay Natural History 

 Society. 



This species is distinguished from A. hrachjurus by its 

 shorter frontals and longer nasals and the lesser development 

 of postorbital processes. 



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

 noticed and drew my attention to its difference from 

 A. hrachyxirus, and himself collected the specimen from 

 S.E. Siam. 



Anderson's Hystrix yunnanensis has markedly shorter 

 nasiils than any of the porcupines here referred to. 



The Chinese porcupine, Acanthion subcristaius, Swinh., has 

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

 to be more as in A. hengalensis and hodgsoni. 



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

 have been referred to Phyllotis, Euneomys, and Eligmo- 

 dontia. By Oldfield Thomas. 



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



The South-American Muridee which have been referred at 

 various times by various authors to the genera mentioned in 

 the title, as also to Reithrodon and Hesperomys, have hitherto 

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

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



