250 Mr. O. Thomas on 



Original number 180. Collected 18th June, 1922, by T. V. 

 Slierrin. Presented by the Godman Exploration Fund. 



Readily distinguishable from all the hitherto known forms 

 of the ''^ peregrinus " group by its clear ashy-grey colour. 



The complete disagreement of this North-Queensland 

 specimen with Pennant's description ot* the Endeavour-River 

 animal obtained by Banks, on which the name peregvinus is 

 founded, shows that the latter name should not be used for 

 any member of the group typified by the common ring-tailed 

 opossum of New South Wales, and I therefore use Grould''s 

 name laniginosus for the latter. To what species peregrinus 

 really applies is not yet clear, but it was probably what we 

 know as P. herhei'tensis, Collett, of which I believe P. h. col- 

 lettij Waite, to be the young. 



The Rock Psbudocrirus of the Northern Territory. 



Dr. Matschie * has divided the Ring-tailed Phalangers into 

 three subgenera — Pseudochirus, Pseudochtrops, and Pseudo- 

 chiruluSj — of which Ps, peregrinuSf albertisi, and canescens 

 are respectively typical. 



He has included in the second the North Australian 

 Ps. dahliy but this animal appears to me to be so different 

 from any of the others as also to need a special subgenus for 

 its reception. Its rock- instead of tree-haunting habits, its 

 peculiar short tail, and, in the skull, its excessively inflated 

 mastoids — which rise on each side higher than the occipital 

 crest, — and the extreme imperfection of the palate, whose 

 vacuities extend from the level of the back of m} to the 

 palation, being only bounded behind by a narrow bar, are all 

 characters which indicate its super-specific separation from 

 the other members of the genus. I would therefore propose 

 to make for it a special subgenus, which might be called 

 Petropseudes. 



XXVII. — On some small Mammals, chiefly Bats, from the 

 East Indian Archipelago. By Oldfield ThomaS. 



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



By the kindness of Dr. de Beaufort, of the Amsterdam 

 Museum, I have been privileged to work out the large series 

 of small mammals, in spirit, from the East Indian Archi- 

 pelago there preserved, and to describe such new forms as 

 occur among them. 



* SB. Ges. Neat. Fr. 1915, p. 83. 



