Vol. XIII, pp. 137-150 April 21, 1900 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



SEVEN NEW RATS COLLECTED BY DR. W. L.\^^''^^^'^\4 

 ABBOTT IN SI AM.* ' "- ^"" 1 



BY GERRIT S. MILLER, .Tk. : 



Among the mammals collected by Dr. W. L. Abbott during 

 a second ex))edition to Siam, and ])resented to the United States 

 National Museum are seven large and medium sized species of 

 3f>/s, all of which appear to be new. They were secured in 

 the mountains of Trong, a small state subject to Siam and sit- 

 uated on the west side of the Malay Peninsula about 500 miles 

 north of Singaj)ore. 



KEY TO THE RATS OF TRONG. f 



Hind foot about 50 mm.; skull about 55 mm. 



Tail much longer than head and body: back and sides I 



strongly ochraceous Mux vodferans. 



Tail about equal to head and body: back and sides not i 



ochraceous. ! 

 Fur connposed almost exclusively of fine, grooved 



bristles; ear longer than broad; general color ! 



above iron gray, beneath dull white Mua ferreocanus. i 



Fur composed almost exclusively of coarse hairs, 



with a very few slender grooved bristles inter- I 



mixed: ear as broad as long; general color grizzled • 



brown above, pale bulf below Mh>< rtdidus. ' 



*Published here by permission of the Secretary of the Smithsonian 

 Institution. ; 



\ExGlusive ot Mus 'alexandrinus.'' ' 



31— Biol. See. Wash. Vol. XIII, 1900. (137) 



