124 TREUBIA VOL. II, 1. 
V. Rattus rattus rhionis. 
Mus rattus thionis THOMAS & WROUGHTON, Ann. & Mag. Nat. Hist 
(8) III, 1909, p. 441, Bintang Id, Riouw Archipelago; Id., Journ. Fed. Malay 
States Mus. IV, 1909, p. 123. 
Mus sp. near rattus (partim) LYON, Proc. U. S. Nat. Mus. XXXI, 1907, 
p. 655 (Batam Id); KLOss, Journ. Straits Branch Royal Asiat. Soc. No. 50, 
1908, p. 69. 
The following specimens are in the Zoological Museum at Buitenzorg: 
il Tandjong Pinang, Riouw Id, S. E. of Singapore 
2 © Residentie Riouw Onderhoorigheden, Mammae 10 
lg Palembang, S. E. Sumatra 
This form is very dark above, sometimes almost black, and rather 
dark grey below (neutral grey). I cannot separate the Palembang example 
from the others: the type series came from Bintang and from its neighbour, 
Batam Id. The two females from the ,,Dependencies” probably came from 
Bintang. The record for Sumatra is the first. 
