NO. 1534. OIANT SQUIRRELS OF SUMATRA— LYON. 441 



portion of the tail is distincth^ anmilated. Cat. No. 141052, 

 U.S.N.M., a nearly adult male from Tarussan Bay, is in general 

 similar to Cat. No. 114597, U.S.N .M., but the mantle is darker and 

 the reddish brown less conspicoiis. Eight of the specimens have the 

 light colored mantle well-marked, while in the remaining 1.3 it is 

 practically absent. In certain skins, the mantle seems to be the result 

 of a bleaching of the hairs as the pelage becomes old, but its presence 

 in the two immature individuals shows that it may be found in fresh 

 pelages. The pelage of the type is also apparently fresh. When the 

 l^elage is old, the hairs of the back, either imiformly or in irregular 

 patches, assume a dull, dirty russet color; the tail assiunes tliis color 

 throughout and loses all traces of annulation, the light subapical 

 bands of the hairs having nearly all worn ofl', and the tips of the hairs 

 having a curled and singed appearance. 



Shull and teetlt. — The skull and teeth of Bofiifa paUiatn are large and 

 heav}", and are as easily distinguished on this account from those of 

 the liypoleuca group as are the skins. The differences between skulls 

 of R. 'palliata and R. hicolor are slight. The material at hand shows 

 the Sumatran species to have shorter rostrum, nasals, and audital 

 bulla:% and the zygomatic width somewhat greater. 



Measurements. — See page 445. 



Specimens examined. — Twenty-two; 9 from Aru Bay, 2 from Salat 

 Rupat, 1 from the Indragiri River, 6 from Tarussan Bay, 1 from 

 Tapanuli Bay, IfromGunong wSugi,and 2 simply marked "Sumatra." 



Remarks. — Ratnfa palliata is apparent!}" uniforndy distributed over 

 the island of Sumatra. (See map, Plate XXXIII.) Specimens from 

 various localities agree in all essential respects with the type, but it is a 

 matter of regret that the species is not represented by a good series 

 from the type locality. 



RATUFA HYPOLEUCA (Horsfield.) 



1824. Sciuriis liypolccos Horsfield, Zoological Researches in Java (pages not 

 numbered). 



Type. — In the British Museum, collected by Sir Stamford Raffles, 

 and hence probably from Bencoolen on the west coast of Sumatra. 

 I have not seen the type of this species, nor specimens from the type 

 locality. The following description is based on specimens from the 

 vicinity of Tarussan Bay on the west coast of Sumatra, which agree in 

 all respects with Horsfield's description of the species. 



Diagnostic characters. — Upper parts uniform light brown, under- 

 parts white, feet concolor with legs; size large. 



Color. — Middle line of back from behind shoulders to base of tail 

 brown, not identical with any color in Ridgway's "Nomenclature of 

 Colors," but nearest a dark Vandyke or Prout's brown; not con- 

 trasted with rest of upper parts; top of head and neck from behind 



