DESCRIPTION OF A NEW SQUIRREL OF THE SCIURUS 
PREVOSTII GROUP FROM PULO TEMAJU, 
WEST COAST OF BORNEO 
By MARCUS WARD LYON, Jr. 
ASSISTANT Curator, Division oF MAmMats, U. S. Nationa, Museum 
In the summer of 1905 Doctor W. L. Abbott collected on Pulo 
Temaju two specimens of a squirrel related to Sciurus prevostii, but 
which differ conspicuously from the known members of the prevostii 
group. Pulo Temaju’ is a small island lying off the west coast of 
Borneo, about half a degree north of the equator. It is described by 
Doctor Abbott as “about two and one-half miles long; about four 
miles from the mainland of Borneo; it is hilly and most of the sur- 
face is now planted with cocoanuts.” The water between it and 
Borneo is twelve to fourteen fathoms in depth. At Doctor Abbott’s. 
suggestion this squirrel has been named 
SCIURUS PROSERPINAE new species 
Type.—Skin and skull of adult female, No. 142285, United States 
National Museum, collected on Pulo Temaju, about four miles off 
the west coast of Borneo, June 9, 1905, by Doctor W. L. Abbott. 
Original number, 4180. 
Diagnostic characters—Related to Sciurus borneoensis Schlegel ; 
but the usual white side stripes, nearly suppressed, darkened to slate- 
gray, and the underparts generally the seal-brown of Ridgway. 
Color—Upperparts of head and body, upper surfaces of feet, outer 
surfaces of legs and basal and terminal sixths of tail, black; under- 
parts of body and inner surfaces of legs, a fine grizzle of a dark 
reddish-brown and black, producing a general effect of seal-brown. 
Base of whiskers, a grizzle of black and white, the latter color pre- 
dominating ; cheek spot present, but very inconspicuous ; the shoulders. 
faintly grizzled with light buffy; lateral stripe, short, 60-70 mm. im 
length, about 10 mm. wide; the hairs with black bases and dull white 
ends, but many are black throughout. The general effect of the 
stripe at arm’s length is slate-gray. The lateral stripe is separated 
-from the seal-brown underparts by a narrow (2-3 mm.), black 
* Also written Temadjoe and Temadju. 
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