no. 1809. MAMMALS FROM BORNEO AND VICINITY— LYON. 79 



LARISCUS DIVERSUS (Thomas). 



1898. Funambulus insignis diversus Thomas, Ann. Mag. Nat. Hist., ser. 7, vol. 2 

 p. 248. September, 1898. Type-locality, Baram River, Eastern Sarawak, 

 Borneo. 



Seven specimens of Lariscus collected in southern Borneo by Doctor 

 Abbott differ in no essential respects from north Bornean specimens 

 as described by Thomas. The latter's remarks about the Bornean 

 form "perhaps averaging slightly larger" than the Sumatran form 

 does not hold good as regards the present specimens and Sumatran 

 examples from Tarussan Bay. The Borneo skulls are distinctly smaller 

 and more slender than are the Tarussan Bay skulls. 



(For measurements and exact localities of the seven specimens, see 

 table, p. 92.) 



Doctor Abbott has collected four distinct forms of prevostii squirrel 

 on the Bornean mainland. They are Sciurus borneoensis borneoensis 

 from the higher ground north of the Kapuas River, S. b. palustris 

 from the swampy region north of the Kapuas River, S. sanggaus 

 from southwestern Borneo, south of the Kapuas River, and S. atri- 

 capillus from southeastern Borneo. Colored illustrations of all four 

 forms are well shown on plate 4 which was made directly from the 

 skins. 



SCIURUS SANGGAUS Lyon. 



1907. Sciurus sanggaus Lyon, Proc. U. S. Nat. Mus., vol. 33, No. 1577, p. 554, 

 December 24, 1907. 



In addition to the original large series of squirrels of this species 

 taken along the south bank of the Kapuas River in 1905, Doctor 

 Abbott has secured twenty-seven others from the coast region of 

 southwestern Borneo. (For exact localities, see table of measure- 

 ments, p. 83.) Although the large series of specimens of this squir- 

 rel taken as a whole are fairly uniform in coloration, yet there is 

 a tendency toward differentiation shown by specimens from certain 

 localities in the range of the species. Skins from Sukadana agree in 

 every respect with those from Sanggau. One from the mouth of the 

 Sempang River, Cat. no. 145441, and two others from the Semendang 

 River have darker and "redder" shoulders than usual, in this respect 

 being very much like the two specimens from Pulo Kubu in the orig- 

 inal series of S. sanggaus, but not quite so dark. Nearly all the 

 squirrels from along the Kapuas River below Sanggau have the 

 underparts darker in color than the Sanggau and the Sukadana skins. 

 Specimens from the Kendawangan River region have the underparts 

 a lighter "red" and the shoulder area and sides of head and neck 

 lighter in color and the white of the thighs less grizzled with black 

 than have the Sanggau or Sukadana specimens. The different 

 members of this species may be roughly placed in three groups: 

 1. The Sanggau-Sukadana specimens, typical of the species. 2. The 



