MAMMALS FROM SIAM. 57 



Diagnosis. — Closely resembles E. r. klumensis in colour, but 

 ■with the under surface generally slightly silvererl, especially in 

 immature individuals. Size slightly larger, but tail considerably 

 shorter. Nasals relatively rather narrower posterioi'ly, but skull 

 otherwise apparently not differiug from the mainland I'ace except 

 in greater size and robustness. 



Measurements. — Ear of type, 23 mm. For other measurements 

 see table, p. 75, 



S2)ecimens examined, — Fifteen from type-locality. 



37. Epimys rattus kraensis, subsp. n. 



T7/pe. Adult female (skin and skull), No. 1550/C.B.K. 

 B.M. No. 15.11.4.203. Collected in Koh Kra Id., S.E. Siam, 

 l(3th December, 1914, 



Diagnosis. — The largest of the known local forms of JE. ratius, 

 but with tail relatively shorter than in E. s. khtmeiisis. Colour 

 like E. r. maJcensis, but the grey edges of the abdomen n)ore 

 intense and skull with broader rostrum and nasals : anterior 

 zygomatic roots lieavier : the zygomatic plate broader and more 

 convex, projecting fui'ther forwards ; the plate laterally com- 

 pressed and more vertical, resulting in a narrower infraorbital 

 foramen. 



Measitrements.-^^ee table, p. 75. 



Specimens examined. — Twenty-one from the type-locality. 



38. Epimys griseiventer Bonhote. 



Mils griseiventer Bonhote, Fasciculi Malayenses, Zoology, 

 Part 1, p. 30, pi, ii, fig. 3, and pi, iv. tig. 5 (1903). 



A single example only of a I'at that a,ppeai'S referable to this 

 species was obtained on Koh Chang. As my camp was close to 

 a village, which is a port of call for steamers, it is quite possible 

 that the species has been introduced. The uniform upper surface, 

 smoky-grey underparts tinged with buff, dark feet, and black tail 

 distinguish it from forms of E. rattus. 



Head and body 181 mm,, tail 212, hind foot 34, ear 22. 



39. Epimys concolor Bonhote. 



Mus concolor Bonhote, P. Z. S, 1900, p, 195 ; id,, op. cit. 1902, 

 vol. i. p. 39 ; Flower, op, cit. 1900, p. 361 ; de Pousargiies, 

 Mission Pavie, Indo-Chine, Etudes Diverses, iii. p. 528 (1904); 

 Gyldenstolpe, Arkiv fijr Zoologi, Stockholm, Band 8, No. 1, p. 18 

 (1914). 



Numerous specimens of this little rat were brought to me by 

 the children of Klong Yai for the sake of a cent, or two, but all 

 were immature, and I only preserved five examples. 



40. Epimys berdmorei magnus, subsp. n. (Text-fig. 1.) 



Type. Adult female (skin and skull). No. 1890/C.B,K. 

 B.M, No, 15.11.4,157. Collected at Klong Menao, S.E. Siam, 

 12th January, 1915. 



