A NEW MURINE GENUS AND SPECIES FROM SINI). 



999 



Skull very much as in Pyromys above described. Upper profile 

 bowed. Supra-orbital ridges well developed. Posterior nares 

 narrowed, the opening some way behind molars. Bulla? large. 



Teeth as in Pyromys. 



Type.—Grtjpomys gleadowi (Mus gleadowi, Murray). 



This genus combines the foot structure of Millardia with the 

 narrow and produced choanse of Pyromys. A new born specimen 

 even of G. gleadowi shows no trace of the fifth and sixth foot pads. 



It may be noted that these three allied genera may be distin- 

 guished from each other by the number of their mamma* alone. 

 these being in Pyromys 4— 2=12 (i.e., four pectoral and two 

 inguinal pairs), Millardia 2—2=8, and Grypomys 1—2=6. True 

 Mus, in the modern sense, containing the Mus musculus group, 

 and Leggada, have 3—2=10. In Epimys the number varies from 

 1—2=6 to 3 — 3=12 but the anterior are never more numerous 

 than the posterior. In the one Indian species of Apodemus 

 (A. arianus) the number is 1—2=6. Vandeleuria, Golunda and 

 Hadromys all have 2 — 2=8. 



HADROMYS, g. n. 



General appearance as in Golunda. Form stout. Tail rather 

 short. Sole pads six. Fifth fore toe very short ; fifth hind toe 

 reaching just to base of fourth. Mammse 2 2=8. 



Skull shaped almost exactly as in Golunda, with the same short 

 muzzle and well marked supra-orbital and parietal ridges. The 

 anterior edge of the zygomatic plate is however concave, and the 

 posterior palate ends behind the last molar. 



Incisors very broad and heavy. Molars wholly unlike those of 

 Golunda, more like those of Epimys, rather hypsodont, with 

 lamminee well defined. No unworn specimens are however 

 available for examination. 



Type. — Hadromys humei (Mils kumei, Thos.*) 



The wide difference of " Mus humei " from every other murine 

 has long been evident, and its distinction as a special genus is 

 now obviously called for. Its resemblance, both external and 

 cranial, to Golunda is very striking. 



* Described in detail, P. Z. S., 1886, p. 63. 



