246 Mr. O. Thomas 07i Mammals from 



Hellwaldi, Jent., M. Musschenlroechi, Jent., M. Meyeri, 

 Jent., M. celebensts, Gray, J/, xanthurus^ Grray, M. calli- 

 trichus, Jent., M. neglectus, Jent. (?), M. epMppium, Jent., 

 and Craurothrix'^ leucura^ Gray. The skins of the last- 

 named quite agree with the type of ^^Echiothrix lemura^'' and 

 confirm Dr. Jentink's record of Celebes as the true locality 

 of this remarkable rat. 



In addition to these, two new species of Mus were obtained, 

 whose descriptions follow : — 



Mus fratrorumy sp. n. 



Size about as in Mus rattus. Fur of medium length, soft, 

 without longer bristles intermixed. Ears large, evenly 

 rounded. General colour above brownish grey, finely 

 sprinkled with dull yellowish. Head rather paler, but the 

 circumference of each eye slightly darker. Under surface 

 dirty greyish yellow, the bases of the hairs slaty grey, their 

 tips dull yellowish ; line of demarcation on sides little 

 marked. Hind feet rather elongate ; fifth hind toe reaching 

 to the middle of the first phalanx of tlie fourth ; upper surface 

 of hands and feet silvery white. Tail somewhat shorter than 

 head and body, finely scaled (about 11 scales to the centi- 

 metre), its proximal two thirds above brown, its end and the 

 whole of its under surface white. 



Skull with rather a small cranial and long facial portion. 

 Supraorbital beads distinct, although not strong. Front of 

 zygoma-root little projected forwards. Anterior palatal 

 foramina of medium length, not reaching back to the level of 

 ^^. Molars large and heavy. Bullaj small. 



Dimensions of the type (an adult male in skin) : — 



Head and body 193 millim, ; tail 157 j hind foot (moist- 

 ened) 38-8 ; ear 20. 



Skull : basal length 37*5 ; basilar length to henselion 34'3 ; 



greatest breadth 21*2 ; nasals 19-4x4-6; interorbital breadth 



6-4, interparietal 5x9'5; diastema 12; palate length from 



henselion 19-2; palatal foramina 7-4x3-2; length of upper 



molar series 7-6; breadth of palate outside — --i 9*2, inside 

 ma 4.5^ 



Hah. Ruriikan, Celebes, 3500 feet. 

 Coll. Charles and Ernest Hose. 

 Type killed Oct. 8, 1895. 



* Nom. nov. 



Echiothrix, Gray, P. Z. S. 1867, p. 699, nee 



Echinothrix, Peters, MB. Akad. Berl. 1853, p. 487 (Echinodermata). 



