113 



Ivongitudo ab apice rostri ad basin auris 



tarsi digitorumque 



aiiris 



Hab. Mindanado. 



" This species is rather larger than Sc. Palmarum, and less than 

 Sc. bivittatus. The general Ime of the upper parts, sides of the 

 body, and outer side of the hinder legs, is deep brown (a much richer 

 and deeper colour than the same parts in Sc. bivittatus) : this tint is 

 produced by the admixture of rust colour and black, the hairs being 

 of the latter colour, and rather broadly annulated with rusty-red 

 near the apex. The tail is not very bushy : the hairs are black, with 

 two bright rusty bars. The under parts of the body are grayish 

 white, with a faint yellow tint : the head and fore legs are grayish, 

 and the feet are black, slightly grizzled with rust colour." 



Mr. Waterhouse then proceeded to point out certain differences 

 observable in the skulls of two species of Squirrels, which are usually 

 confounded under the name Scitirus Palmarum, and the external 

 characters of which he had pointed out in the " Magazine of Natural 

 History" for September 1837, p. 496. The Sjjecific name trislriatus 

 is there proposed for the new species. 



" The skull of Sciurus tristriatvs," observes Mr. Waterhouse, 

 " differs from that of Sc. Palmarum in being a little larger, consider- 

 ably broader in proportion, and in having the upper surface less 

 convex ; the post-orbital process is larger, the width between the 

 orbits is greater, and the nasal portion is more suddenly contracted ; 

 the nasal bones are larger, and narrower posterioily. Following are 

 the dimensions of the crania of these two species of Squirrel." 



Sc. Palmarum. Sc. iristriatua. 

 unc. 



Total length 1 



Width 



between orbits 



Length of nasal bones 



From outer side of incisors (upper jaw) 1 



to front m )lar tooth j 



Space occupied by the five molars on 1 



either side of upper jaw j 



Length of palate 



of ramus of lower jaw from! 



front to posterior part of condyle , . j 



