51)8 UR. J. E. GRAY ON AUSTRALASIAN RATS. [M«y -3, 



Mus (Gymnomys) CELEBENSIS. 



Grey brown, with rather rigid blackish longer hairs, most abun- 

 dant on the middle of the back and rump ; sides of the nose, cheeks, 

 chin, middle of the throat, chest, underside of the body, and legs 

 pure white, divided from the dark colour of the upper part of the 

 body by a well-marked line ; tail elongate, basal third blackish, the 

 rest yellow ; feet slender, blown, covered with short soft hair above ; 

 ears rather broad, naked. Length 10 inches, of tail 11 inches, of 

 hind foot about 1 inch 10 lines. (Female.) 



Hab. Menado (North Celebes), 1859 (JVaUace). 



Mr. Wallace obtained at Sadong, in Borneo, in 1855, a female Rat 

 similar to the above in size, but varied with yellow and black hairs 

 above, whitish yellow below, and with an entirely black tail. The 

 cutting-teeth are yellow and smooth ; the lower one without any in- 

 dication of a longitudinal grove. 



Mus XANTHURA. (Yellow-tailcd Forest-Eat.) 



Fur above yellow grey brown, yellow- and black-washed, especially 

 on the hinder part of the back ; sides of nose, cheeks, chin, throat, 

 chest, underside of body, and limbs white ; the longer hairs of the 

 back black, rather rigid, those of the hinder part of the back much 

 longer, blacker, and projecting beyond the base of the tail ; the hair 

 of the sides of the vent longer, yellow, with some stiffer longer black 

 hairs intermixed ; feet dark brown, hairy above ; tail elongate, nearly 

 naked, only with a few short hairs near the tip, black at the base 

 for about one-third of its length, the rest yellow ; up])er cutting-teeth 

 flat and yellow in front ; the lower very narrow, rather compressed, 

 white, smooth, without any indication of a central longitudinal 

 groove. 



Hab. North Celebes ; TondiAViO {Wallace), 1859, female. 



Mr. Wallace observes, " This is a forest-rat, eats rice ; was taken 

 at an elevation of 3GG0 feet." The long black hair over the rump 

 has an inclination to form two dark streaks, each ending in a black 

 point on the sides of the base of the tail. 



ACANTHOMYS LEUCOPUS. 



Grey brown above ; sides of nose, cheeks, chin, underside of body, 

 and legs white ; feet thick, large, white, slightly covered with short 

 close-pressed white hairs ; tail elongate, naked, black, with two or 

 more yellow rings. The fur of the back with abundant flat, chan- 

 nelled, spinous hairs, and with a few scattered, elongate, black, cy- 

 lindrical bristles. The fur of the underside with similar sj)inous 

 hairs, those on the sides and back being often dark-tipped. The 

 cutting-teeth are yellow and quite smooth in front ; the upper ones 

 are flat ; the lower ones rather narrow and rounded in front. The 

 ears are nearly naked. The whiskers moderate, slender, flexible, 

 weak. Eves small. 



Hab. North Australia ; Cape York {Mr. Dumen). 



There is an adult female of this species, with four lateral ventral 



