552 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



SCIURUS BORNEOENSIS BORNEOENSIS (Miiller and Schlegel). 



1839-44. Sdurus rafflesii var. borneoensis Muller and Schlegel, Verhandl. 

 Natur. Geschied. Nedorland. Overz. Bezitl. Leiden, p. 86. 



Ten of the prevostii squirrels collected by Doctor Abbott in western 

 Borneo may be referred to this form. For a list of them, with exact 

 localities, see table of measurements, page 556. Sdurus homeoensis 

 appears to be a very variable species, inhabiting western Borneo 

 north of the Kapuas River. South of that river a very different 

 prevostii squirrel occurs, which is described on page 554. The squirrels 

 north of the river fall into two distinct forms, the typical red-shoul- 

 dered homeoensis, apparently confined to the uplands, and a dark- 

 bellied black-shouldered form, described below as a new subspecies, 

 confined to the swampy lands near the mouths of the rivers. Above 

 Tanjong Putus, on the Landak River, and above Pulo Saparo, on 

 Kapuas River (see map, frontispiece). Doctor Abbott collected the red- 

 shouldered form, while below these points the specimens all have 

 blackish shoulders. Three skins from Tanjong Putus, collected on 

 July 15, are referable to the typical form, while two others also 

 marked Tanjong Putus, collected on July 16, are referable to the 

 dark-shouldered variety. As Doctor Abbott collected while descend- 

 ing the rivers, the two skins obtained on July 16 are probably from a 

 slightly lower point on the river than the three taken on the previous 

 day. 



While visiting the Ley den Museum, Mr. Gerrit S. Miller, jr., made 

 the following notes on the cotypes of Sciurus homeoensis. 



Cotypes, three [lettered: o, jp, and q\, all from Pontianak. They are very uniform 

 in color, all showing the strongly grizzled sides above the pale lateral stripe, the clear 

 black area on shoulders being reduced to 20-25 mm. Most of the caudal hairs, except 

 at base and pencil, with cream buff tips about 10 mm. long. In one specimen the 

 feet are red, in the others they are black sprinkled with red hairs. Red area rufous, 

 darkening to chestnut. Cheek and sides of neck a mixture of black, red, and white, 

 each color slightly predominating in one specimen, ^^^litish spot below eye distinct 

 but very small; whitish patch at base of whiskers conspicuous. Measurements: 

 o (300) [head and body] 250 [tail vertebrae] 60 (55) [hind foot with and without claws], 

 p (280) [head and body] 250 [tail vertebrae] 58 (53) [hind foot with and without claws], 

 q (290) [head and body] 280 [tail vertebrae]. 



The three specimens taken on July 15 at Tanjong Putus, on the 

 Landak River, about 25 to 30 miles above Pontianak, agree very well 

 with the above account. Cat. No. 142307, U.S.N.M., from the north 

 bank of the Kapuas at Sanggau, agrees most closely with the published 

 figure*^ of S. homeoensis in respect to general coloration. It lacks 

 the conspicuous white spot at base of whiskers, however, and the 

 white lateral stripe is not subtended by a conspicuous black stripe. 

 None of the squirrels of this species collected by Doctor Abbott 

 either of the typical form or not, has a conspicuous wliite patch at 



^Nederland. Tijds. Dierkunde, I, pi. i, fig. 3. 



