96 Messrs. H. C. Robinson and C. Boden Kloss on 
14. Rattus bukit champa, subsp. un. 
Much darker than R. 6. bukit (Bonhote) of the Malay 
Peninsula; bullae much larger. Nearest in colour to the 
dark form from the lowlands of Java, R.b. temmincki, Kloss, 
but posterior termination of nasals broader, palatal foramina 
and bullee still larger. 
Not so bright as R. b. marinus, Kloss, from the islands 
Koh Chang and Koh Kut, 8.H. Siam, the rostrum shorter, 
the interpterygoid space narrower, and the bull larger. 
Type.—Aged female (skin and skull) collected on the 
Langbian Peaks, South Aunam, 6000-7000 ft., on 20th April, 
1920, by C. Boden Kloss. No. 3474/CBK. 
Specimens examined.—Thirty-four from the type-locality ; 
four from Arbre Broyé, 5400 ft. ; thirty-five from Dalat, 
4500 ft.; two from Dran, 3000 ft., Langbian Mountains ; 
and three from Daban, Phanrang Province, South Annam, 
650 ft. 
15. Rattus blythi mekongis, subsp. n. 
Externally like R. dlythi * from North Tennasserim and 
Western Siam, but the skull with the nasals broader 
posteriorly, the interparietal longer and the interpterygoid 
space broader. 
Type.—Adult male (skin and skull) obtained at Bak Mat 
on the Mekong River, Laos (lat. 18°53’ N.), on 20th January, 
1920, by H. CG. Robinson. and ©. Boden Kloss’s collector. 
No. 7172 2/S. é 
Specimens examined. —The type and another specimen from 
Muang Liep, 25 miles down river ; compared with seven 
examples of R. blythi from near Raheng, W. Siam. 
Remarks.—We are uot 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 relationship of the Mekong 
animal ‘with that from Schwegyin we have referred it to 
blythi. 
For measurements sce table on p. 98. 
16. Rattus cremoriventer langbianis, subsp. n. 
Most nearly resembling &. c¢. cretaceiventer, Robinson 
& Kloss, of Java; but a little duller in colour and the tail 
more finely ringed. 
* Rattus blythi, Kloss (Mus cinnamomeus, Blyth, nom. preoce.), Ree. 
Ind, Mus. xiii, 1917, p.8; id. Journ. Nat. Hist. Soc. Siam, iv. 1921, p. 65. 
