148 Miller — Seven New Bats collected in Siain. 



breadth, 14; breadth' of braincase above roots of zyj^omata, Ki; depth of 

 braincase at front of basioccipital, 10.8; fronto-palatal depth at posterior 

 extremity of nasals, 8.8; least depth immediately behind incisors, 7; 

 maxillary toothrow (alveoi). 6.8; width of first upper molar, 2; mandi- 

 ble, 21.5; mandibular toothrow (alveoli), (i.o. 



Specimens examined. — C)ne, the type. 



Remm-kii. — While this ^i^ecies is very distinct from Mus jerdoni, its re- 

 lationship to Mus surifer is questionable. Dr. Abbott writes that he ex- 

 amined numerous individuals and that in the flesh they could be invaria- 

 bly distinguished from the species with which they were associated. 

 The white spot on the head he regards as a normal character. 



Mus surifer sp. nov. 



Type adult male (skin and skull) No. 86,746 United States National 

 Museum, collected in the mountain of Trong, Lower Siam, at an altitude 

 of about 3,000 feet, January 14, 1899. 



Characters. — In general appearance much like Musjerdoni and M. pdlax, 

 but larger and more robust than either. Fur thickly spiny. Tail about 

 equal to head and body, though usually somewhat longer, bicolor with 

 exception of terminal third or fourth, which is entirely dull white. 

 IIi)id leg from knee to heel uxualln ochraceoux on both sides thus separating 

 white of inner side of thigh from that of foot. Skull much larger and 

 more conspicuously ridged than that of Mus jerdoni. 



Fur. — The fur is as in Mus jerdoni and M. creinorirenter. 



Color. — Upper parts uniform tawny ochraceous, heavily sprinkled wilh 

 blackish brown on posterior half of back, less so on shoulders and head. 

 Sides, tianks, cheeks and outer surface of legs clear tawny ochraceous. 

 Underparts white to base of hairs. The white extends down inner sides 

 of front legs to wrists, but on hind legs it normally reaches barely be- 

 yond knee, below which the entire leg is ochraceous, though slightly 

 dulled on inner side by the dusky bases of the hairs. Occasionaly, how- 

 ever, the white extends in a narrow irregular line to heel. F'eet dull 

 white. Ears and dorsal surface of tail to terminal third or fourth dark 

 brown. Underside of tail and whole of terminal third or fourth dull 

 white. 



Tail. — The tail is distinctly annulated, though less evenly than in 

 Mus rremoriventer. There are about 12 rings to the centimeter at middle. 

 The rings are indistinctly divided into sections slightly longer than broad, 

 from the free edge of each of which spring 1-3 hairs equal in length to 

 width of about one and one half rings. At tip the rings become nar- 

 rower and less regular, the hairs at the same time increasing in abund- 

 ance, but not in length, and not forming a pencil. 



Skva.—'rhi> skull of Mils surifer (PI. V, Fig. 4) is conspicuously larger 

 than that of M. jerdoni (PI. V, Fig. 1), though not very different in form. 

 Supraorbital ridges high and continued backward to interparietal, and 

 in old individuals forming a strong postorbital angle. Incisive foramina 

 relatively much shorter and wider than in Mus jerdoni, distinctly wider 

 posteriorly than anteriorly. 



