240 Mr. 0. Tliomas on 



busliy to the tip, about as in Petaurus, the terminal three 

 inches below, however, naked, transversely wrinkleJ, very 

 much as in some of the smaller Phalangeridse. 



Skull essentially as in Marmosa, but the muzzle longer 

 and lower; height from crown of anterior molariform tooth 

 to forehead little more than one-third the palatal length, 

 while it is about one-half in Marmosa. Nasals expanded 

 behind. Supraorbital ledges well developed, but not forming 

 angular postorbital processes. 



Teeth generally as in Marmosa, but the incisors of different 

 proportions. 1^ but little longer than the others and less 

 than any of them in section ; z^~* subequal, rather large, i* 

 smaller than they ai'e. In Marmosa, and indeed in all other 

 opossums, i^ is either equal to or larger than the other lateral 

 incisors. Molars small, their shape about as in Philander, 

 the last one similarly broadly triangular, and not narrowly 

 as in Marmosa. Lower incisors more proclivous than usual 

 and the canine more upright, so that tliere is a greater gaj) 

 between their respective tips. 



lype:— 



Glironia venusta, sp. n. 



A fawn-coloured opossum with striped face and bushy 

 white-tipped tail. 



Size about as in the larger species of Marmosa. Fur soft 

 and velvety; hairs of back 7-8 mm. in length. General colour 

 above fawn, with something of the pink tone of "ecru drab" 

 in it. Undersurface grey, the bases of the hairs slaty and 

 their tips greyish white, but on a small patch on the chest the 

 hairs are white to the roots. Head with the maximum 

 develojjment of the black-striped type of coloration, almost 

 ec[ua\\iug Diakechurus pemiatus in this respect; the middle 

 line of the head from nose to occiput greyish white (hairs 

 slaty at base), bordered on each side by a broad black band 

 about half an inch in breadth starting on the side of the nose, 

 passing across the eyes and behind the ears, and ending about 

 level with the back of the skull. Ears naked, oval, nar- 

 rower than in Marmosa, a small greyish patch round their 

 posterior base. Hands and feet dull brownish white. Tail 

 cylindrical, bushy, tapering terminally, very like that of 

 Petaurus brevicepsy the hairs 1-1-15 mm. in length halfway 

 down ; grey like the body proximally, darker and browner 

 on the third quarter, and then abruptly changing to white on 

 the terminal fourth. 



Skull and teeth as described above. 



