Vol. XXIV, pp. 167-170 June 16, 1911 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF FOUR NEW TREESHREWS. 



BY MARCUS WARD LYON, JR. 



[By permission of the Secretary of the Smithsonian Institution.] 



Daring his recent Zoological explorations of the Malayan 

 Archipelago, Dr. W. L. Abbott collected, among numerous 

 other mammals, representatives of four species of treeshrews 

 which have not been previously described. They may be 

 known by the following descriptions. 



Tupaia raviana sp. nov. 



Type.— Skin and skull, old adult male, Cat. No. 104,355, U. S. N. M., 

 Pnlo Rawi, Butang Islands, off west coast Malay Peninsula, Dec. 18, 1899, 

 Dr. W. L. Abbott. Grig. No. 172. 



Diagnostic characters. — Related to T. belangeri of the neighboring 

 mainland and T. lacernata of Pulos Langkawi and Terutau, but skull 

 generally wider, and rostrum especially thicker and wider, interorbital 

 region wider, zygomata more spreading; skin rather intermediate 

 between the two, but more like that of T. belangeri. 



Color. — Type: Upperparts of head, neck, body, and outer side of legs 

 a grizzle of a color between buff and olive-buff, and blackish, the two 

 colors about equally mixed, and the huffy color inclining toward 

 ochraceous buff in the region of the thighs; underparts generally huffy 

 or an extremely pale gallstone yellow; tail a hue grizzle of cream color 

 and blackish, the latter predominating above and both about equally 

 prominent below except in the middle line where the lighter color is in 

 excess; shoulder stripe not conspicuous, dull cream color. 



Skull. — In general like that of T. belangeri and T. lacernata, but the 

 skull is generally wider, with thicker anil wider rostrum and more spread- 

 ing zygomata. This shows more differences from the related forms than 

 does the skin. 



Measurement*. — Type, and Cat. No. 123,984, V. S. N. M., Tupaia 

 lacernata, an old adult male from Pulo Terutau: Head and body, 

 184, ISO; tail, 165, 145; hind foot (dry), 40, 44; condylobasal length of 

 skull, 46.5, 46; zygomatic width, 25.5, 24.5; width of braincase above 



29— Proc. Biol. Soc. Wash., Vol. XXIV, 1911. (167) 



