HAPALOMYS. 401 



The Indian genera are thus distinguished : 



A. Tubercles on anterior lower molars in 3 longitudinal 



series HAPALOMYS. 



B. Tubercles on lower molars in 2 series. 



. First and fifth digits of all feet with flat nails . . VANDELEUBIA. 



b. Pollex and hallux only with flat nails, crowns of 



molars deeply grooved longitudinally OHIROPODOMYS. 



c. Pollex (thumb) dhly with a flat nail, other digits 



(except hallux in Mm chiropus) with compressed 

 claws ; crowns of molars not deeply grooved. 

 a'. Upper incisors not grooved. 



n". Dorsal fur wholly or chiefly composed of 



hair. 

 a. Form slender ; transverse laminae of molars 



considerably curved Mrs. 



/3. Form stout: laminae nearly or quite straight NESOCIA. 

 b". Back entirely covered with stout spines . . ACOMYS. 

 b'. Upper incisors grooved longitudinally GOLUNDA. 



Genus HAPALOMYS, Blyth (1859). 



Hallux terminating in a broad tip bearing a flat nail. Each of 

 the other digits (except the rudimentary pollex) swollen at the end 

 into a lobe, which is deeply grooved 

 longitudinally above, pitted at the 

 anterior end of the groove, and trans- 

 versely furrowed below to the end 

 like the remainder of the digit. 

 The claws, which are blunt and but 

 little curved, apparently lie in the 

 groove, especially in the fore feet, 

 which have much shorter claws than 

 the hind feet. In both, however, 

 "<* th Digits project beyond 

 H. longicaudatus, x3. tne claws - Tai1 lon g> terminal por- 



tion flattened laterally. Skull with 



the nasals short, anterior border of zygoma-root vertical. Incisors 

 smooth, lower incisors very broad ; the two anterior molars in both 

 jaws with tubercles arranged in 3 longitudinal series. 



This genus, containing a single known species, differs from all 

 other Muridse in having the tubercles of the anterior lower molars 

 triserially arranged. 



269. Hapalomys longicaudatus. Berdmore's Rat. 

 Hapalomys longicaudatus, Blytli, J. A. S. B. xxviii, p. 296 (1859), 

 xxxii, p. 353 ; id. Cat. p. U2 ; id. Mam. Birds Burma, p. 38. 



Fur soft, dense and long. Tail much longer than the head and 

 body, scaly and ringed, with short fine hair that becomes longer on 

 the terminal third of the tail. Ears short, rounded, scantily clad 

 with long hairs. Feet short. Foot-pads large, peculiarly marked 



