78 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



IOMYS LEPIDXJS, new species. 



Type.— Skin and skull of adult male, Cat. No. 153684, U.S.N .M., 

 collected at Batu Jurong, southwestern Borneo, June 27, 1908, by 

 Dr. W. L. Abbott. Original number 6005. 



Diagnostic characters. — Related to Iomys tliomsoni (Thomas) l 

 from which it differs in its smaller size. 



Color. — Type: General color of upper parts of head and body, of 

 upper surface of parachute, and of outer surface of fore and hind legs 

 dark, hair brown, irregularly and finely lined with the buffy or cream 

 buff subterminal annulations of the hairs, the buffy color darker and 

 the annulations wider about the sides and the shoulders; under 

 surface of parachute and inner side of forelegs bright ochraceous 

 buff, under surface of neck and body, and inner surface of hind legs, 

 and scrotum, pinkish buff, a small spot on chin whitish; upper 

 surface of tail an indefinite brownish color, but much "reddened" by 

 the showing through of the ochraceous to ochraceous-rufous of the 

 hairs of the underside of tail; underside of tail nearly a clear, but 

 rather dull ochraceous-rufous; sides of head and neck, below eye and 

 ear, buffy to ochraceous-buff ; inner side of ears with only a few short 

 hairs, not enough to color them, outer side of ears nearly naked on 

 distal half, basal half with hairs colored like those on top of head. 



Measurements. — External: Type, Cat. No. 153684, from Batu 

 Jurong and paratype, Cat. No. 151792, young adult male, from 

 Klumpang Bay, and those of the type of Iomys tliomsoni, respectively: 

 Head and body, 190, 189, 231 mm.; tail, 190, 176, 199; hind foot with 

 claws, 38, 40, 40.5. Cranial measurements: Greatest length of skull, 

 42.7, 42.3, 46.5; basilar length, 32.5, 33.5, 37; greatest breadth, 27.4, 



— , 29.6; length of nasals, 13, 12.2, 13; upper cheek teeth, 8.7, 9.3, 

 9.2. 



Specimens examined. — Two. 



Remarks. — While Iomys lepidus is closely related to /. tliomsoni, 

 yet its smaller size serves to distinguish it. In color both forms are 

 very much alike as far as can be told without an actual comparison 

 of specimens. /. lepidus probably ranges throughout southern 

 Borneo, while I. tliomsoni is very likely confined to the northern por- 

 tions of the island. 



This .squirrel was one of a pair which had a nest of leaves about 11 inches in diam- 

 eter, in the top of a small sapling, about 20 feet from the ground. They both 

 flew out on the tree being shaken, the male going to a large tree trunk, where he was 

 shot. The other was lost sight of. — W. L. A. 



» Ann. Mag. Nat. Hist., ser. 7, vol. 5, p. 275, March 1900. Type-locality, Bakong River, Eastern 

 Sarawak, Borneo. 



