On a new Species of Pteromys. 403 



the outer half of the sole, and extending diagonally and 

 longitudinally across it. 



Tail. — Not flat, as described in Pteromys generally, but 

 round, full, furry, and villose, incapable of eradiation, but 

 erectile — generally wrapped round the body in repose. 



Mamma — are 6 — two pectoral and four ventral, at least 

 so I have counted them in two specimens. Cuvier says, 

 " six ventral." 



Colour. — Full neutral or bluish iron grey above, the fur 

 being blackish for the first or root half, and hoary whitish 

 grey the rest, so that the fur has a mottled appearance. 

 All the lower parts mealy white ; eyes black ; nose flesh 

 colour ; hair round nose, on eye-brows, and upper lip rusty. 

 Triangular patch of black above the nose ; eyelids and bases 

 of whiskers blackish ; from eye to ear darker grey ; cheeks 

 grey mottled with pale tawny hairs, fading off to white of 

 under parts ; paws (hind and fore) rusty greyish black, 

 which colour also anteriorly edges the parachute bone. The 

 edge of parachute all round is pale mottled grey, slightly 

 rusty, and within this an ill-defined cloud or band of darker 

 grey extends inwards. 



The fore-arm is anteriorly rusty, mottled, and there is a 

 slight shade of the same in the parachute and hind leg. 

 The tail is as the back, but gets rapidly darker towards 

 end, and is at the tip as black as the paws. Claws a rusty 

 horn colour. 



Parachute. — Completely encircles the body from shoul- 

 der to shoulder, forming a chord to the flexure of the fore- 

 arm, gradually diminishing from wrist to the calcis, and em- 

 bracing about one-fifth of the tail. The membrane is thin, 

 flexible, vascular, and above and below clothed with thin 

 downy fur. It is supplied by two large veins from near 

 the axillae and lumbar region, which ramify over the surface. 

 The parachute is extended considerably beyond the utmost 

 stretch of the arm, by a supplementary bone, which arti- 



