2 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.45. 



In addition to examining specimens in these museums, I have also 

 had for study specimens sent to Washington from the following 

 institutions: 



Museum, Philippine Bureau of Science, 12 specimens, 1 type. 



Selangor Museum, Selangor, Straits Settlements, 8 specimens, no 

 types. ^ 



Academy of Natural Sciences, Philadelphia, 6 specimens, no types. 



I was unfortunate in my time of visiting the Natural History 

 Museum in Leyden. The director. Dr. F. A. Jentink, who has direct 

 charge of the mammals, was on his vacation and I was unable to 

 examine the specimens of Tupaiidse in that museum. The material 

 contained there as listed by Jentink ^ does not appear vitally impor- 

 tant for a systematic review of the group, yet it contains some very 

 interesting and historical specimens, which I regret not having seen. 

 Among them are the unique type of Dendrogale murina and the 

 only skeleton of the genus Ptilocercus that I know of existing in 

 museums and the cotypes of Tana dorsalis. Dendrogale murina is 

 the only species of treeshrew of which I have not seen examples. 



I take pleasure in here expressing my thanks to the directors of the 

 museums which I personally visited for giving me the privilege of 

 studying the available material in their institutions, or from which 

 material was borrowed. 



The importance of the explorations of Dr. W. L. Abbott in our 

 knowledge of the treeshrews can not be lost sight of. With the 

 exception of less than a dozen specimens in the United States 

 National Museum the entire series of treeshrews there was collected 

 through his untiring efforts. This means that more than a third 

 of the specimens of treeshrews in all the museums of America and 

 Europe have been personally collected by Doctor Abbott. Among 

 them are 29 types. Indirectly he is also responsible for the tree- 

 shrews collected by Messrs. Kloss and Robinson on the Malay 

 Peninsula, or adjacent islands. 



The text figures of the skulls and teeth of the various genera 

 were made bj^ Mr. A. J. Engel Terzi. 



Measurements. — -All the measurements are in millimeters. With 

 the exception of those of the head and body and of tail of skins, they 

 have all been made by the writer, including those of the hind foot, 

 which includes the claws. In most cases the measurements of the 

 head and body and tail were made by the collector in the flesh. In 

 the tables of measurements where the head and body and tail measure- 

 ments are followed by ±, those measurements were made by the 

 writer from the dried skin or mounted specimenf Head and body 

 and tail measurenlents of specimens preserved in alcohol were also 



1 There are, however, in the Selangor Museum, 4 types, none of which I have seen. 



2 Cat. Ost6ol. Manun. Mus. Hist. Nat. Pays-Bas., vol. 9, 1887, and Cat. Syst. Mamm. Mus. Hist. Nat. 

 Pays-Bas, vol. 12, 1888. 



