8 Dr. F. A. JENT1NK. MAMMALS. 



Mammae : o — 2.= 4. 



head and body 160 mm. 



tail 135 „ 



ear 16 „ 



hindfoot 37 » 



Colour of upper- and underparts so exactly like in the true Mus rattus, that I prima 

 vista thought it truly was a rrt/to-specimen ; however the tail is too short, is white for its 

 terminal half, the fingers are white, hindfeet white except on the upperparts, moreover there 

 are only 4 inguinal mammae. It therefore is évident that the animal is not a rattus-s^ecïmen, 

 meanwile compared with the other known skort-tz.i\ed Mus-s<p&cies from New Guinea it cannot 

 been brought under one of those heads. I name it ratticolor, indicating its external likeness 

 with our common black rat. The skull has been smashed, however I could safe the molar- 

 rows as well as the palate ; and it appears that the palate-ridges (fig. 11) also are quite 

 différent from those in rattus. 



S. Pogonomys multiplicatus Jentink. 

 N°. 52. Very young maie (in alcohol), van Weel's Camp, June 8. 1907. 

 Some measurements in mm. : 



head and body 140 



tail 98 



ear 15 



hindfoot 39 



The animal is so young that no molar yet has pierced the gum ! It would be as a 

 rule therefore practically impossible to make out to what species it belongs; however the 

 palate-ridges are very numerous and agrée so closely with those in my multiplicatus (Nova 

 Guinea, Vol. V, Zoologie, p. 367), that I think we safely may bring it under that head, 

 notwithstanding the type-specimen is from the opposite part of New Guinea, viz. Humboldt 

 Bay, Sentani Lake ; but our very young animal moreover has the same beautiful hue as I 

 described from the type-specimen, and the underparts of the same fine white colour. The type- 

 specimen being a young animal having only two molars in each jaw, it measured notwithstanding 

 this 185 mm., so that we may présume that when fullgrown it must be a very large animal ; no 

 wonder that our Van Weel's very young spécimen attains a length as many fullgrown rat has. 



The above may prove the necessity to take into considération the shape and number 

 of the palate-ridges when describing externally closely allied species. 



\\mXc — v~^~ 



9. Pogonomys Lorentzii n. sp. 



N°. 132. Adult female (in alcohol), Resi Camp (900 meters), September 1907. 



Mammae o — 2=4. 



The skin of the distal half of the tail has been stripped off. 



Some measurements in mm. taken in the flesh : 



head and body 185 



tail 122 



hindfoot 36 



ear 18 



