hilherto referred to " Mus." 



fiOo 



Australian aiul Papuan spociis : — 



arborlcola, Rams. { = rallus). 



asuiirti/iit, (tould. 



broumi, A 1st. 



coliflti, Tho.s. 



culmorum, Thos. & Dollin. 



e.rultnis, Pcale. 



fuscipes, Waterh. 



yestri, Thos. 



grei/i, (iiiiy. 



lutrt'ola, Ciiav. 



mauicatus, Giould. 



tnaorittm, Hutt. 

 7nor<I<u; Thos. 

 prtetor, Tlios. 

 sordidus, (lould. 

 terrre-rer/ina, Alat. 

 tunjifi/i, Tlios. 

 vel/crosits, (iray. 

 velutimi'i, Thos. 

 villosissimuit, Waite. 

 woodwardi, Thos. 



PsiiUDOMYS, Gray. 

 P. Z. S. 1832, p. 39. 



Size variable, mostly nmcli smaller tlian in Epimi/.t. 

 Peet(MaI nianiinai not known to be ])rescut in any species, 

 the t'ornnila being — 2 = 4 in all in which it can be deter- 

 niined. 



ykull not heavily l)uilt and quite without supraorbital 

 ridcres; the interorbital re^^ion narrow, p:irallel-sideil, with 

 rounded or, in a few species, squared edires. Front edge 

 of zygomatic plate, structure of pterygoid region and of 

 molars, varying in the different .'subgenera. 



Range. Australia and Tasmania, not extending into New 

 Guinea. 



Type. Pseitdomi/s cnislralis, Gray. 



Tins genus contains specie.s of very varied skull and molar 

 structure, and it is with some hesitation that 1 leave such 

 diverse species as, for example, P. auslra/is and P. forresti 

 under the same generic heading. But as the characters, 

 marked as they are in extrenie cases, seem to be .^^lighter or 

 variable in others, I think the division of Pseudomys into 

 subgenera may best serve our present purpose. 



Of these there would be four, as Ibllows : — 



1. PSEUDOMYS, 8. 8. 



Size large. General form of skull inclining towards that 

 of Cunilarus and Leporil/us by the flat or even concave con- 

 dition of the posterior nasal region and the bold projection of 

 the anterior part of the zygomata. Front edge of zygomatic 

 plate concave, with a projecting point above, as in Nolon/i/s, 

 though not so strongly marked. Palatal foramina large. 

 Pterygoid region showmg an intermediate condition between 

 the normal one and the flattened state described below under 



