1906.] FROM johor:^ and Singapore. 11 



the south of the Peninsula. Individuals vary somewhat amongst 

 themselves, some being rathei^ lighter in their general coloration 

 than others, but the lightest have a considerably darker appearance 

 than Mus jalo7'ensis. 



They belong, as I pointed out in my former paper, to the 

 Pyctoris sub-group of J/^(.s rattus, and may be distinguished by 

 their soft fur, medium size, short tail, and pure ivhite under parts, 

 the hairs being white to their bases. 



Mus GRISEIVENTER Bonh. 



Mus griseiventer Bonh. Fasc. Malay., Zool. vol. i. p. 30 (1903). 

 a-c. 2 S ,1 2 . Pelepak. Johore, March 1905. 

 f^^. 3 J,l $. Pulai, S.W. Johore, Nov. 1904 and Jan. 

 1905. 



h. S- Johore Bahru, 3rd April, 1905. 



i-n. 3 o , 2 2 . Kangka Senibong, Johoi-e, Sept. 1905. 



0. 6 . Pasir Gudang, Johore, 11th May, 1905. 



This is the really common House-rat of the Peninsula; its greyish 

 or yellowish under parts enable it to be easilj^ recognised from 

 M, jalorensis or M. jarah, the hill foi'ms of Mus rattus. In size, 

 too, it is rather larger than the preceding species. 



Mus NORVEGICUS Erxl. 



Mus norvegicus Erxleben. 



Mits decumanus Pall., Flower, P. Z. S. 1900, p. 362. 

 7 c?, 9 5 , Johore Bahr'u, April, June, and August, 1904. 

 So far as can be judged, this Rat is apparently found only on 

 the Peninsula in the neighbourhood of shipping. 



Mus CONCOLOR Blyth. 



Mus concolor Blyth, J. A. S. B. xxviii. p. 295 (1859); Bonh. 

 Fasc. Malay., Zool. vol. i. p. 38 (1903). 

 a-c. S ■ Pelepak, Johore, March 1905. 



d. (S . Tebraun, Johore, SejDt. 1905. 



e. S • Johore Bahru, July 1904. 



f. g. c? 2 • Kangka Senibong, Sept. 1905. 

 h. 2 . Pasir Gudang, May 1905. 



Mus MuscuLus Linn. 



Mus mitscid'us Linn. Syst. Nat. xii. p. 83 (1776) ; Flower, 

 P.Z.S. 1900, p. 362. 



a. S . Johore Bahru, Feb. 1904. 



EXPLANATION OF PLATE I. 



Mus inas, p. B. 

 Mus hlossi, p. 9. 



