VOL. XIII, PP. 137-150 APRIL 21, 1900 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON SEVEN NEW RATS COLLECTED BY DR. W. L. ABBOTT IN SI AM.* BY GERRIT S. MILLER, JK. Among the mammals collected by Dr. W. L. Abbott during a second expedition to Siam, and presented to the United States National Museum are seven large and medium sized species of Mus, 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 Singapore. 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 strongly ochraceous Mus vociferans. Tail about equal to head and body; back and sides not ochraceous. Fur composed almost exclusively of fine, grooved bristles; ear longer than broad; general color above iron gray, beneath dull white Mus ferreocanus. Fur composed almost exclusively of coarse hairs, with a very few slender grooved bristles inter mixed; ear as broad as long; general color grizzled brown above, pale buff below Mus validus. *Published here by permission of the Secretary of the Smithsonian Institution, f Exclusive of Mus 'alexandrmus.' 31-BiOL. Soc. WASH. VOL. XIII, 1900. (137)
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