418 Dr. J. E. Gray on Rats. 



lobe of the lower jaw, and by the very great length of the 

 upper and lower lobes of its hinder edge. 



Fig. 2. 



Skull of Heliomys Jeudei. 



Heliomys Jeudei. (Fig. 2.) 



Hah. Unknown. 



Bandicota. 



Skull elongate, about twice as long as wide at the hinder 

 part of the orbits. Nose elongate. Slit before the orbit short, 

 with a thick callous front edge, oval and expanded above. 

 Palatine slits elongate. 



Bandicota gigantea. 



The British Museum received two specimens of a male and 

 female rat, which Dr. A. B. Meyer obtained at Aru Island in 

 April 1870, and at Buntimunang, in the south-west part of 

 Celebes, in November. It is intermediate in size and the 

 harshness of the fur between the Bandicote and the Norway 

 rat {Mus decumanus). 



Uromys, Peters. 



Skull elongate, about twice as long as broad at the hinder 

 part of the orbit. Nose arched down. Slit before the orbits 

 short ; front edge simple, with a conical projection contracting 

 the slit and expanding into an oval form above. The palatine 

 slits rather short. 



Dr. Peters established this genus upon a rat which I had 

 described under the name of Mus macropus (P. Z. S. 1866, 

 p. 221) — calling it Uromys macropus (Peters, Monatsber. 1867, 

 p. 3, t.), and giving a very good figure of the animal, with 

 details of its skull ; but macropus is a larger species than U. 

 aruensis, the skull is not so arched and bent down in front, 

 and the tail is nearly two thirds white and the basal third 

 dark. The palatine slits are equally short in both species. 



Uromys aruensis. 

 Reddish brown : back, especially in the middle', varied with 



