1906.] FEOJI JOHCR^: AXD SINGAPORE. 11 



the south of the Peninsnla. Indivickials vary somewhat amongst 

 themselves, some being rather lighter in their general coloration 

 than others, but the lightest have a considerably darker appearance 

 than Mus jalorensis. 



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

 Pyctoris sub-group of Mus rattus, and may be distinguished by 

 their soft fur, medium size, short tail, and 2)ure ivhite luider parts, 

 the hairs being white to their bases. 



Mus GRISEIVEXTER Bonh. 



Mus griseiventer Bonh. Fase. Malay., Zooh vol. i. p. 30 (1903). 



«-c. 2 S ,\ 2- Pelepak, Johore, March 1905. 



d-cj.-^ c?,l ?. Pulai, S.W. Johore, Nov. 1904 and Jan. 

 1905. 



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



i-n. 3 c? , 2 $ . Kangka Senibong, Johoi-e, Sept. 1905. 



0. d ■ Pasir Gudang, Johore, 11th May, 1905. 



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

 or yellowish under pai'ts enable it to be easily recognised from 

 M. jalorensis or M. jarak, the hill forms of Mus rattus. In size, 

 too, it is rather larger than the preceding species. 



Mus NORVEGICUS Erxl. 



Mus norvegicus Erxleben. 



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

 7 S,9 $ ■ Johore Bahru, April, June, and August, 1904. 

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

 the Peninsula in the neighbourhood of shipping. 



Mus CONCOLOR Blyth. 



Mils 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. J. Tebraun, Johore, Sept. 1905. 



e. (S . Johore Bahru, July 1904. 



f. g. d 2 • Kangka Senibong, Sept. 1905. 

 h. 2 • Pasir Gudang, May 1905. 



Mus MUSCULUS Linn. 



Mus mioscidus Linn. Syst. Nat. xii. p. 83 (1776); Flower, 

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



a. c?. Johore Bahru, Feb. 1904. 



EXPLANATION OF PLATE I. 



Mus inas, p. 9. 

 Mus klossi, p. 9. 



