1905,] MAMMALS OF CHIKA. 385 



8. Mils losea Swinli. 



9. Mus grisei2)ectus A, M.-E. 



10. M'us noi-vegicus Erxl. 



11. Mus humiliaUis A. M^.-'Fi. . . 



12. M%(,s mtcscuhos Linn. 



13. Micromys splvaticus chevrieri A. M.-E. 



14. Alicromys sylvaticus draco Barr.-Hamilton. 



15. Micromys minut'iis 2^yg'inceus A. M..-^. 



16. Micromys agrarms Tuanc/itcricios Thos. 



17. Alicromys agrarms nhigjjoensis Swinli. 



Mus EDWARDSI TllOS. 



Mus edwardsi Thos. P. Z. S. 1882, p. 587, pi. xliv. ; Thos. 

 P. Z. S. 1898, p. 773; Bonh. Fasc. Malayenses, Zool. vol. i. 

 pp. 33 & 36 (1903). 



This species was originally described from four examples sent 

 to Paris by Pere David. The type is in the B.M. 82.6.16.1, 

 the other three examples being in Paris and dated October 1872. 

 This is a very large Rat belonging to the jerdoni group, of 

 which it is t^^Dical of the subgroup bearing its name. The British 

 Museum now possesses a fine sei'ies of these Rats from Kuatun 

 in N.W. Fokien. They seem to be very uniform and shoAV 

 remarkably little variation. 



The genei'al colour is yellowish grey, some specimens being 

 much yellower than others. Each hair is slate-grey at its base 

 and fulvous foi' the distal half, and interspersed among these haii's 

 are long slender spines with dark tips as well as long black 

 bristles. On the flanks, owing to the absence of the black bristles, 

 the fulvous colour of the fur proper is moi-e visible. 



The vmder parts are pure white. The tail is ecpial in length to 

 the head and bod}?-, markedly bicolor, and covered with short 

 hairs, while the last two or three inches are pure white. The 

 feet are uniform dark broAvn with white margins and toes. 

 Whiskers very long and entirely black with the exception of a 

 few shorter white ones. 



The shull partakes of the usual characters associated with the 

 jerdoni group, e. g., long, narrow, flat, and with small bullfe. The 

 supraorbital ridges are well defined over the orbits and slightly 

 flattened so as to produce a comparatively broad upper surface ; 

 they end somewhat abruptly about halfway across the parietals. 

 Below, owing to the smallness of the buUpe, the basioccipital 

 presents a broad surface and the external condyles are well 

 developed. 



The dhnensions (as given by Thomas and rendered into milli- 

 metres) are as follows : — Head and body 300 ; tail 289 ; hind 

 foot 57 ; ear 24. 



Skull. Greatest breadth 57 mm. ; basilar leng-th 44 ; palatal 

 length 24-5 ; diastema 15 ; incisive foramina 10 ; length of nasals 

 22*5 ; zygomatic breadth 26 ; interorbital breadth 9*5 ; breadth 

 of brain-case 22 ; length of molar series (alveoli) 11. 



