00 Messrs. II. 0. Kobiiison and C. CoJeii Kloss on 



11. Rat his bu/cit c/uanpa, subsp. n. 



Much darker than R. b. bukit (Bonliote) of the Mahiy 

 IViiiusuhi ; biilhe imich larger. Nearest in colour to the 

 (lurk form from the lowlands of Java, R.b. tejuinincki, Kloss, 

 but posterior termination of nasals broader, palatal foramina 

 and buIUc still lar-^er. 



Not so bright as R. b. marinus, Kloss, from the islands 

 Koh Chang and Koh Kut, S.E. Siam, the rostrum shorter, 

 the interpterygoid space narrower, and the bulke larger. 



Ji/pe. — Aged female (skin and skull) collected on the 

 Langl)ian l-'eaks, South Annani, ()0()()-70U() ft., on 20th April, 

 VJh), by C. Boden Kloss. No. 317-1, CHK. 



Specimens examined. — Thirty-four from the type-locality ; 

 four from Arbre Broyo, 5400 ft. ; thirty-five from Dalat, 

 -AoOO ft. j two from Dran, 3000 ft., Langbian Mountains; 

 and three from Daban, Phaurang Province, 8outh Aunam, 

 G50 ft. 



15. Rattus blythi mekongis, subsp. u. 



Externally like R. blytJn * from North Tennasserim and 

 Western Siam, but the skull with the nasals broader 

 posteriorly, the interparietal longer and the interpterygoid 

 s])ace broader. 



Type. — Adult male (skin and skull) obtaiued at Bak Mat 

 on the Mekong lliver, Laos (hit. lb"53'N.), ou 20th January, 

 1920, by H. C. Robinson and C. Boden Kloss's collector. 

 No. 7172/S. 



Specimens examined. — The type and another specimen from 

 Muang Liep, 25 miles down river ; comi)are(l with seven 

 examples of R. blytki from near llaheng, VV. Siam. 



Remarks. — We are not in a position to say whether Rattus 

 blythi is a distinct species or only a form of an older-named 

 species; but to show the intimate relatiojiship of the Mekong 

 animal with that from Schwegyin we have referred it to 

 blyt/d. 



For measurements see table on p. 98. 



16. Rattus cremoriventer langbianis, subsp. n. 



Most nearly resembling R. c. cretaceiv enter, Robinson 

 & Kloss, of Java ; but a little duller in colour and the tail 

 more finely ringed. 



* liatlus Ui/thi, Kloss (Mas cinnamomens, T^lytli, nom. prajocc), Kec. 

 Ind. Mas. xiii. 1917, p. 8 ; id. Journ. Nat. Hist. iSoc. yiaui, iv. 1921, p. 6-3. 



