KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 60- N:0 6- 31 



forms of Oriental Squirrels belong to the Hylopetes-group: 1) H. everetti Thos. from 

 the Natuna and Bunguran Islands. 2) H. alboniger Hodgs. from the Himalayas to 

 Cambodia. 3) H. nigripes Thos. from Palawan. 4) H. spadiceus Blyth from Arakan. 

 ö) H. phayrei phayrei Blyth from Rangoon, Burma. 6) H. phayrei probus Thos. 

 from Mount Popa, Burma. 7) H. phayrei laotum Thos. from the Laos Mts. 8) H. 

 aurantiacus Wagn. from the Island of Bänka. 9) H. platyurus Jent. from N. E. 

 Sumatra. 10) H. belone Thos. from Pulau Terutau. 11) H. sagilta Linn. from Java. 

 12) H. amoenus Miller from Pulau Kundur, Rhio Archipelago. To this same group 

 may also be referred H. harrisoni Stone from Menbuang river, Sarawak, and H. 

 harrisoni caroli Gyldenst. from Eastern Borneo. 



Thomas also referred two other species viz. S. phceomelas Gunther from the 

 Baram river in Borneo and S. tephromelas Gunther from the Malay Peninsula to 

 the H ylopetes-growp, but in the Journal of the Federated Malay States Museums, 

 vol. VI, part I, 1915, p. 23 Robinson and Kloss have created a special genus 

 for these two forms under the name of Aeromys. In this genus the teeth resemble 

 those of Hylopetes, but the crowns are not flat, though provided with two transverse 

 ridges meeting on an elevated cusp on the inner margin of the upper teeth ; there 

 is no deep transverse notch at the postero-internal angle. Further the sides of the 

 ridges are sculptured and wrinkled, and p 3 is well-developed and placed interiör to 

 the anterior extremity of p 4 , which latter is of about equal size as m 1 . 



26. Rheithrosciurus macrotis Gray. 



Proc. Zool. Soc. London 1856. p. 341. 



No. 33. J Camp 6 3 Eastern Borneo -\\ 15» 14 (2.000 feet). Head and body: 349 mm. Tail: 299 

 inni. Hindfoot: 84 mm. Kar: 42 mm. — No. 36. <£ Camp G. Eastern Borneo l /a i 9 14 (2.C00 feet). Head 

 and body: 337 mm. Tail: 321 mm, Hindfoot: 81 mm. Ear: 42 mm. 



Two specimens of this big and characteristic Squirrel were obtained by Mr. 

 Lumholtz. It only inhabits Borneo, where it also seems to be rather rare. General 

 colour above dark brown, inclining to chestnut, minutely punctulated with rufous. 

 The hindquarters, including the base of the tail and the outer sides of the före- and 

 hind limbs nearest >mahogany red» (Ridgway pl. 2), brightest on the latter. From 

 the axilla to the groin a blackish brown stipe, bordered above by a yellowish white 

 band. Chin, throat and upper breast white. Remainder of lower parts yellowish 

 white, slightly tinged with påle brown. Tail very broad and clad with brownish black 

 long hairs, which become whitish towards the tips. The middle area of the tail al- 

 most mahogany red below. Ear tufts black. The skull is very large and much larger 

 than in any other known Squirrel. The incisors, both in the upper and lower jaw, 

 are provided on their anterior surface with a couple of ridges, generally ten, an 

 arrangement found in no other squirrel. 



