MAMMALS OF BANKA, MENDANAU, AND BILLITON ISLANDS, BETWEEN SUMATRA AND BORNEO. By Marcus Ward Lyon, Jr., Assistant Curatar, Division of Maimnals. This paper is based on 274 specimens of mammals collected on the islands of Banka and Billiton and on the little island of Mendanau Ij'ing off the west coast of Billiton (see map, page 577), b}' Dr. W. L. Abbott, between January 20, 1904, and August 14, 1904, and pre. sented to the United States National Museum. No general account, so far as I am aware, has appeared concerning the mammal fauna of Banka. Jentink** has twice published lists of the mammals of Billiton. Man}" specimens in the collection of the Leyden Museum are recorded from Banka b}-Schlegel, b}" Jentink,^ and l\v Midler.' Recently Willink'' has published a list of the mammals of the Dutch East Indies, showing the species known from Banka and Billiton as well as from many other islands. Banka, also spelled Bangka, the larger of the two islands, is just off the coast of Siunatra from which it is separated b}" a channel less than 10 miles wide in places and varying in depth between 10 and 19 fath-oms. The average width of the island is about 50 miles and its length, which extends from northwest to southeast, is about 150 miles. There are several hills on it, the highest of which is in the northern part and is recorded as being 2,296 feet in altitude. Doctor Abbott's remarks on his collecting stations are given be3'ond. Billiton, measuring about 50 miles square, lies nearl}" 50 miles to the east of the southern extremity of Banka. The highest hill on it is said to be 1,673 feet in altitude. The waters between Banka and Billiton have a depth ratiging from 19 to 29 fathoms. A number of small islands occupy this channel. Doctor Abbott collected only on one of them, Mendanau, about 4 miles to the west of Billiton. Billi-" Notes, Leyden Museum, XII, 1890, pp. 149-154; and XIII, 1891, pp. 207-209. 'J Catalogue Systematique des Mammiferes. Catalogue Osteologique des Mammi-feres, and Siniiae. Mus. d'Hist. Nat. Pays-Bas. '■Yerhandl. Natuur. Geschied. Nederl. Over. Bezitt. ZooL, 1839-44. ''Natuurkundig Tijdschrift Nederlandsch-Indie, XLV, 10th ser., Pt. 9, pp. 153-345. Proceedings U. S. National Museum, Vol. XXXI— No. 1498. 575
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