MAMMALS OF THE NATUNA ISLANDS 1 23 



allies by its small skull, scarcely larger than that of Funambidus 

 macclellaiidi. 



SCIURUS NATUNENSIS (Thomas). 



1894. Schirus /otvz Thomas and Hartert, Novitates Zoologicae, i, p. 659. 

 September, 1894 (Sirhassen), 



1895. Sciurus lowi natitnensis Thomas, Novitates Zoologicae, 11, p. 26. Feb- 

 ruary, 1895 (Revised determination of Sirhassen specimen). 



1895. ? Sciurus lowinatunensis Thomas and Hartert, Novitates Zoologicae, 

 II, p. 491. (Bunguran and Pulo Laut.) 



Four specimens from Sirhassen. The average and extreme meas- 

 urements are as follows: total length 222 (215-229) ; head and body 

 135 (133-140) ; tail vertebrae %6 (82-89) 5 hind foot 33.6 (33-35) ; 

 hind foot without claw 31.5 (30.5-32). 



SCIURUS LINGUNGENSIS sp. nov. 



1895. ? Sciurus lowi 7iatunetisis Thomas and Hartert, Novitates Zoologicae, 

 II, p. 491. (Bunguran and Pulo Laut.) 



Type. — Adult male (skin and skull) No. 104693 U. S. National 

 Musuem. Collected on Pulo Lingung off southern extremity of Bun- 

 guran, North Natuna Islands, June 19, 1900. Original number 494. 



Characters. — Externally similar to Sciurus natunensis (Thomas), 

 but slightly larger (hind foot with claws 36 Instead of 33.6). Skull 

 larger than that of S. natmze?zsis^ the audital bullae much broader 

 anteriorly. 



Color. — The color is precisely as in Sciurus natunensis., and there- 

 fore requires no detailed description. 



Skull. — Skull larger than that of Sciurus natunensis (see measure- 

 ments) but not different in general form. The audital bullae are, 

 however, readily distinguishable by the much greater development of 

 the anterior inner lobe. In Sciurus tzatu7iensis this lobe is so small 

 as scarcely to form any part of the general contour of the bulla. In 

 S. lingungensis it is nearly equal to the anterior outer lobe, together 

 with which it imparts a distinctly triangular outline to the ventral as- 

 pect of the bulla. 



Aleasuretiieitts. — External measurements of type : total length 229 ; 

 head and body 140; tail vertebrae 89; hind foot 36 (33.7) ; ear from 

 meatus 12 ; ear from crown 7. A second specimen from the type lo- 

 cality gives precisely the same measurements. 



Cranial measurements of type : greatest length 38 (36) ;^ basal length 

 33 (3^)5 basilar length 30 (29); palatal length 17 (16); greatest 



' Measurements in parentheses are those of an older specimen of Sciurus natu- 

 nettsis from Sirhassen. 



