DR. F. A. JENTINK. MAMMALS. 



365 



maie from the Sentani Lake is the second individual knovvn from New Guinea and at the 

 same time the first spécimen collected in the northern part of that island. 



RODENTIA. 

 Pogonomys. 



This genus is typified by mice with a préhensile tail, the terminal part of that organ 

 being quite naked and transversely wrinkled; eight species hâve been described as belonging 

 to this genus, viz. one, pulcher, from D'Entrecasteaux Islands and seven from New Guinea; they 

 présent the following measurements according to the original descriptions (in milhmeters) : 





îead and body 



tail. 



hindfoot. 



ear. 



877 macrourus A. M. Edw. 



120 



140 







881 mollipilosus Pet. et Dor. 



100 



16S 



26 



15 



888 Forbesi 0. Thomas. 



156 



222 



3° 



17 



895 pulcher 0. Thomas. 



153 



22 5 



33-7 



17-3 



897 Loriae 0. Thomas. 



148 (149) 



214 (213) 



26 (26.7) 



r 5 (i5-S) 



897 lepidus 0. Thomas. 



n 9 (120) 



169 (159) 



21 (21.5) 



14 (14) 



897 lamia O. Thomas. 



III (118) 



loi (158) 



2+ (25) 



i7 (i7-5) 



904 dryas 0. Thomas. 



114 



184 



23-5 



iS 



For the récognition of the species the number and the shape of the palate-ridges is of 



a very great importance, but up to the présent the authors hâve not paid the attention to 



it as it merits; the palate-ridges in P. pulcher are as in P. Forbesi said Oldfield Thomas, and 



in P. Forbesi they are seven in number, 3 anterior undivided and 4 interdental, according 



to the named author; that is ail. Through the kindness of Dr. GESTRO of the Genoa Muséum 



we possess individuals of four species of Pogonomys and therefore are able to fill the said 



gap, at least partly. In thèse four species the palate-ridges présent themselves as follows : 



P. Forbesi Thomas. The three anterior ones are undivided ; the fore-most one présents itself 



as a trifolium, the other two are slightly bow-bent. There are four interdental ridges, 



interrupted; the anterior pair curved with the free end backward; the second pair less 



curved with the free end slightly backward; the third pair with the free end slightly 



curved forward, meanwhile the fourth pair is very feebly curved with the free end 



strongly directed forward. 



P. lepidus Thomas. The three anterior ones are undivided ; the fore-most one trifolium-shaped, 



the second one looks like an in the middle broken line, the top of which reaches to the 



mentioned trifolium, the third is slightly bow-bent, feebly knocked in. There are three 



interdental ridges, interrupted ; the two anterior pairs feebly curved, the third has the 



anterior margin somewhat crenated, its halves nearly straight and strongly directed 



forward. 



P. lamia Thomas. The three anterior ones undivided ; the fore-most one trifolium-shaped, the 



other two are feebly curved. There are three interdental ridges, interrupted; the two 



anterior pairs curved, the third also curved with a strong direction forward. 



P. Loriae Thomas. The three anterior ones undivided ; the first one a nice trifolium, the second 



one broken in the middle, the top not reaching the trifolium; the third one almost 



Nova Guinea. V. Zoologie. 47 



