On new Australian Muridse. 607 



very large. In proportion to the development of this cusp 

 the laminae are themselves tilted backwards internally, while 

 the outer cusps are reduced in size. 



Type. Pseudomys (Leggadina) for r est i (Mus forresti, 

 Thos.). 



Other species : — 



Ps. delicatulus, Gould. 



Ps. hermannsburgensis, Waite. 



Ps. patrius, Thos. & Dollm. 



4. G-yohys, subg. n. 



Size small. Skull as in Leggadina. 



Molars quite normal; no anterior cingular cusp on m x , and 

 the molar laminae quite of the usual murine shape and 

 position. 



Type. Pseudomys (Gyomys) novce-hollandite (Mus novai- 

 hollandia?, Waterh.) . 



Other species : — Ps. albo-cinereus, Gould, and subsp. 

 squalorum, Thos. Ps. (Gyomys) glaucus, sp. n. (described 

 in succeeding paper). 



LXV. — New Australian Muridse of the Genus Pseudomys. 

 By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



In working out the genera of Australian Muridse the 

 following new species have come to light : — 



Pseudomys auritus, sp. n. 



Hapalotis murinus, Gould, Mamm. Austr. vol. iii. pi. vii. (1855) ; nee 

 id. P. Z. S. 1845, p. 78. 



A large species with long ears. 



Size largest of the genus. General appearance very much 

 as in Ps. lineolatus, but the ears conspicuously longer. Fur 

 long, soft, and thick ; the wool-hairs of back about 14 mm. 

 in length, the longer hairs surpassing them by about 4*5 mm. 

 General colour dark fawn-grey, heavily darkened on the back 

 by the blackish tips of the longer hairs. Under surface 

 soiled buffy, the hairs dark slaty for two-thirds their length, 

 their ends "pinkish buff" ; no line of demarcation laterally. 

 Ears very long ; proectote black with greyish-white tip, 

 sparse hairs of metentote also greyish white. Hands and 



