554 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



Jambu, and Cat. No. 142322, U.S.N.M., opposite Pulo Saparo, show 

 very slight traces of the red about the shoulder, which becomes such 

 a conspicuous feature of Sciurus horneoensis horneoensis. In about 

 half the specimens the white side stripe is subtended by a fairly well, 

 marked black stripe. This black stripe is not very evident in the 

 type. The white is often so arranged on the tail that in certain 

 lights it appears black and white ringed. 



STcull and teeth. — These show no characters by which they may be 

 distinguished from those of the typical form or other species of the 

 same size. 



Measurements. — For measurements of the ty])e and series see table, 

 page 556. 



Specimens examined. — Fifteen. See table, page 556. 



Remar'ks. — Sciurus horneoensis palustris appears to be a dark- 

 shouldered, dark-bellied form of »S'. horneoensis confined to the low 

 swampy lands near the sea. No single specimen in the present 

 series shows a complete intergradation with the typical form, but by 

 picking out various specimens in the two series and using only 

 homologous characters complete intergradation may be found from 

 any style of one to any style of the other form. 



SCIURUS SANGGAUS, new species. 



Tyjie.— Adult female, skin and skull. Cat. No. 142296, U.S.N.M. 

 Collected at Sanggau, western Borneo, south bank of Kapuas River, 

 August 21, 1905, by Dr. W. L. Abbott. Original number, 4357. 



Diagnostic cJiaracters.- — A member of the Sciurus prevostii group, 

 most like Sciurus carimatx Miller,'' but shoulder darker, a grizzle of 

 black and bufl", and the white area of thigh finely mixed with black. 



Color of type. — Nose, top of head, entire upper parts of body, and 

 entire tail, black; entire underparts, inner side of legs, and upper 

 surfaces of feet, ferruginous to orange-rufous; base of whiskers, 

 small spot under eye, lateral stripe 100 mm. long by 10 wide, from 

 just behind shoulder to front of thigh, white; outer side of thigh a 

 coarse grizzle of black and white; sides of head and neck a fine 

 grizzle of black and white, the black in excess; region of shoulder 

 a grizzle of black and pale ochraceous or buff blending in with the 

 ochraceous of the upper arm. 



Variations in the series. — With the exception of two specimens 

 from Pulo Kubu (opposite Pulo Limbang), no noteworthy variations 

 in color are found in the series. In some individuals the cheeks 

 are grayer than they are in the type. One or two specimens show 

 the shoulder area nearly clear gray while in others a light ochraceous 

 predominates. Compared with the series taken on the north bank of 

 the Kapuas, the squirrels south of that river are remarkably uniform. 



aProc. U. S. Nat. Mus., XXXI, p. 57, July 23, 190G. 



