122 MILLER 



1895. Pteroinys nitidtis Thomas and Hartert, Novitates Zoologicae, 11, p. 

 490. December, 1895 (Bunguran). 



1900. Petaiirista tiitidula Thomas, Novitates Zoologicas, vii, p. 592. De- 

 cember 8, 1900 (Bunguran). 



Seven specimens from Bunguran. 



SCIURUS PROCERUS sp. nov. 



1894. Sciurus femds Thomas and Hartert, Novitates Zoological, i, p. 659. 

 September, 1894 (Bunguran). 



1895. Sciurus tenuis Thomas and Hartert, Novitates Zoologicss, 11, p. 492. 

 • December, 1895 (Bunguran). 



Type.—KAxxW. male (skin and skull) No. 10469S U. S. National Mu- 

 seum. Collected on Bunguran Island, North Natunas, July 18, 1900. 

 Original number 574. 



Characters. — Externally similar to Sciurus tenuis though some- 

 what smaller. Skull very much smaller and relatively broader than in 

 the related species. 



Color. — The color is exactly like that of Sciurus tefiuis from Sing- 

 apore. 



Skull atid teeth. — Except that it appears to be broader throughout, 

 relatively to its length, the skull of Sciurus procerus is essentially a 

 miniature of that of S. tetzuis, as the braincase shows none of the ten- 

 dency to increased depth characteristic of the Bornean animal. Ratio 

 of rostral depth to distance between middle of interparietal and lower 

 rim of audital bulla, 50. This ratio is 49 in S. tenuis. 



Measurefnents. — External measurements of type : total length 235 ; 

 head and body 140; tail vertebrje 95 ; hind foot 35 (33). Average 

 and extremes of four specimens from the type locality : total length 

 239-5 (235-247); head and body 140; tail vertebrae 99.5 (95-107); 

 hind foot 35.2 (34-36.5) ; hind foot without claws 32.9 (31.8-34). 



Cranial measurements of type : greatest length 34 (38) ;^ basal 

 length 28.6 (32) ; basilar length 26 (29) ; palatal length 14.6 (16) ; 

 diastema, 7.6 (8.8) ; length of nasals 10.4 (11.4) ; greatest breadth of 

 nasals 4.8 (5.6); interorbital breadth 12 (12.6); zygomatic breadth 

 20.8 (21) ; greatest breadth of braincase 17 (17.6) ; cranial depth from 

 middle of interparietal to lower rim of audital bulla 14 (15); least 

 depth of rostrum 7 (7.2) ; mandible, 20 (21) ; maxillary toothrow 

 (alveoli) 6 (7) ; mandibular toothrow (alveoli), 6 (7). 



Specimens examined. — Six, all from the type locality. 



Remarks. — This species is immediately distinguishable from its 



^ Measurements in parentheses are those of an adult male topotjpe of Sciurus 

 tenuis. 



