Mam7)ialia. 31 



a quarter of an inch. Limbs coloured externally like back, 

 internally dull grey ; upper sides of hands and feet uniform dark- 

 brown ; solepads six, veiy broad, flat, and rounded, evidentlv 

 adapted for climbing; pad at the base of the fifth toe with 

 a secondary pad at its postero - external angle. Claws, both 

 anterior and posterior, short, stout, curved, and sharply pointed, 

 brown horn-colour, that of the hallux markedly shorter than the 

 rest ; pollex with a broad nail as usual ; fifth hind-toe withoiit 

 claw reaching just to the end of the first phalanx of the fourth. 



"Tail veiy long, its posterior luilf black all round, its distal 

 half white or yellow, thinly and finely haired with short grey 

 hairs, not hiding the scales ; the scales large, the rings averaging 

 just ten to the centimetre. 



"Palate-ridges 3-5. IMammce 4, one axillary and one inguinal 

 pair. 

  " Skull 1 lai-ge and strong. Nasals extending to about a milli- 

 metre past the level of the anterior edge of the orbit. Supraorbital 

 edges beaded, but the beading not continued so far forward as 

 in M. everetti. Inteii^arietal large. Front edge of the anterior 

 zygoma- root very prominent, projecting forwards. Palatal foramina 

 very long, their posterior end about one millimetre in front of the 

 level of m.i Bullae small and flattened. 



" Incisors thick and strong, much bevelled externally, their faces 

 dull orange-yellow above and yellow below, but apparently the colour 

 has been more or less affected by spirit. Molars of medium size. 



" Measurements of the type, an adult female in spirit : — Head 

 and body, 222 mm. ; tail, 248 ; hind-foot, 48-o; ear, 13; head, 64; 

 forearm and hand, 66; last hind footpad, 10-5; heel to front of 

 last footpad, 26. 



" Skull :i Basal length, 47-5 ; greatest breadth, 26 2 ; nasals, 

 length 19-5, greatest breadth 5-7; intcrorbital constriction, least 

 breadth 7-0; interparietal, length 6-6, breadth 11-5; length of 

 base of anterior zygoma-root, 6-0; palate, length 30-0; breadth 

 outside m.j 10-3, inside 4-4; palatal foramina, length 10-1 ; back 

 of incisors to m., (ah-eoli), 15-7 ; upper molar series, 9-0. 



" This fine new rat belongs to a small group of species 

 inhabiting the East Indian Archipelago, all of which agree with 

 Mus macleari in being of large size, with very long tails tipped 

 with yellow, and with small rounded ears. ' Their difi'ereutial 

 characters as compared to M. macleari are best put in tabular 

 form: — 



M. macleari. Mammae 1 — 1 = 4. Dorsal piles present. Front 

 edge of anterior zygoma-root projecting, very convex. 

 Palatal foramina long. Bullae veiy small. 

 Christmas Island. 



1 For figures of the skull and teeth see Plate II {bis), figs. 1, 3, 6, 7, 8. 

 This species has beeu figured iu P.Z.S., 1887, pi. xlii. 



