KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 60. N:0 6. 



35 



30. Callosciurus prevosti atricapillus Schlegel. 



Nederl. Tijdschr. Dierk., vol. I, 1863, p. 27, pl. 2, fig. 1. 



No. 121. $ Long Palabar, Boelongean, Eastern Borneo D /& 1914. Head and body: 246 mm. Tail: 

 263 mra. Hindfoot: 55 mm. Ear: 19 mm. — No. 76. $ Kaboerau, Eastern Borneo 5 /s 1914. Head and 

 body: 249 mm. Tail: 175 mm. Hindfoot: 51 mm. Ear: 20 mm. — No. 138. $ Long Palabar, Boelongean, 

 Eastern Borneo — r> 1914. Head and body: 261 mm. Tail: 252 mm. Hindfoot: 50 mm. Ear: 20 mm. — 

 No. 118. ef Long Palabar, Boelongean, Eastern Borneo % 1914. Head and body: 263 mm. Tail: 229 mm. 

 Hindfoot: 51 mm. Ear: 19 mm. — No. 104. <£ Long Pangian, Boelongean, Eastern Borneo ,4 /i 1914. Head 

 and body: 243 mm. Tail: 218 mm. Hindfoot: 47 mm. Ear: 19 mm. — No. 4877. $ Toembang Maroewe, 

 Central Borneo, Sept. 1915. 



The whole series is very uniform and agrees well with the description of G. 

 prevosti atricapillus Schlegel, 1 except specimen 118 vvhich is decidedly darker on 

 the upper surface of the back, where the hairs are only faintly annulated. The 

 black sublateral stripe is very narrow and ill-defined. Round the eye there is a 

 slight indication of a rufous ring. This specimen thus resembles C. prevosti caroli 2 

 Bonh. (Ann. & Mag. Nat. Hist., 7 ser., vol. VII, 1901, p. 173) with which it pro- 

 bably intergrades. 



Skull measurements : 



9 



No. 121 



9 



No. 76 



9 



No. 138 



o" 

 No. 118 



rf 

 Xo. 104 



9 



No. 4877 



Greatest length of skull ' 55,3 55,6 54,8 55,8 52,6 



Length from condylus to gnathion 50,8 51,3 52,3 53,1 48,7 



Baeicranial length of skull 46,9 48,1 48,9 49,9 45,2 



Zygomatic width 35,2 34,9 34,3 33,8 33,1 



Greatest breadth of braincase 24,2 24,1 24,0 23,5 24,0 



Least interorbital breadth 23.0 22,2 22,0 21,2 21,5 



Least postorbital breadth 19,2 19,5 19,3 18,8 18,4 



Length of nasals mesially I 10,1 17,1 16,3 17,2 15,3 



Breadth of combined nasals anteriorly . . . . ] 7,9 9,2 8,1 8,3 7,7 



Diastema 13,4 13,2 13,3 14,2 12,5 



Length of upper toothrow (alveoli) 10,1 10,4 10,5 9,8 10,6 



34,6 

 25,1 

 21,8 

 19,1 



17,2 



7,9 

 12,3 

 11,1 



31. Callosciurus prevosti pluto Gray. 



Ann. & Mag. Xat. Hist. XX, 1867, p. 283. 



No. 2. <£ Kaboerau, Eastern Borneo 9 /i 1914. Head and body: 245 mm. Tail: 264 mm. Hindfoot: 

 47 mm. Ear: 21 min. — No. 55. £ Camp 6, Eastern Borneo 12 /a 1914 (2,000 feet). Head and body: 

 259 mm. Tail: 246 mm. Hindfoot: 52 mm. Ear: 21 mm. — No. 78. § Kaboerau, Eastern Borneo 6 /3 

 1914. Head and bodv: 263 mm. Tail: 239 mm. Hindfoot: 51 mm. Ear: 20 mm. 



In all these three specimens there is a short whitish lateral stripe. It is rather 

 ill-defined and does not extend to the thighs. The whole head, upper surface of the 



1 Type locality: Kapuas River, W. Borneo. 



2 Type locality: Barani, Borneo (low country). 



