MUS. 



307 



tail varies in length, but it is generally longer than the body and head, although it 

 may occasionally fall short of that length. 



The skuU is distinguished from the skull of Jf. sladeni by its shorter muzzle, 

 but in other respects the skulls are much ahke. 



Ileasurements of skull. 



Inferior border of foramen magnum to tip of premaxiUK . . . . 



Tip of premaxilla? to anterior end of palate ....... 



Length of palate ............ 



Length of molar line ........... 



luferior margin of external border of infraorbital foramen to tip of premaxillae 

 Breadth across parietals ........... 



This is the common house rat at Ponsee, Hotha, and Teng-yue-chow. 



* MuS KAKHYENENSIS, n. S. 



Muzzle moderately deep and short ; ear large and rounded, greatly exceeding 

 the distance between the inner canthus and the front of the muzzle and also the 

 interval between the external canthus and the lower margin of the external orifice 

 of the ear ; its breadth also exceeding the former measurement. Feet well deve- 

 loped, the hind foot rather long and slender, equalling the length from the front of the 

 lower lip to the anterior margin of the external auditory meatus. Claws well deve- 

 loped, compressed, moderately curved and sharply pointed. The tail is considerably 

 in excess of the length of the body and head ; finely ringed, five rings to the one-tenth 

 of an inch. Fur long, dense, and soft, reddish-brown on the upper parts, with a dark 

 speckled appearance due to the stronger hairs having broad brown tips. Sides of 

 the head dusky-greyish ; chin to vent, and under parts greyish-white, with a silvery 

 sheen. Feet dusky pale brown. Ears and upper siu-face of tail dark-brown ; under 

 surface of tail j)ale brown. 



Aged 9 

 Tip of snout to vent .............. 2'90 



Vent to tip of tail 3'36 



Hind foot 0'71 



Height of ear 0-55 



Breadth of ear 0-42 



This mouse is distinguished from the common house mouse of Lower Bengal 

 by its relatively shorter tail, longer hind feet, and larger ears ; and from if. homurus 



