234 Mr. O. I'liomas on some 



Sciurus [Microsciurus) palmeri, sp. ii. 



Like -S. (3/.) mimulus, Thos., in almost every respect, 

 with the one important exception that the ornamenting black 

 of the upper surface, which in mimulus consists of a line 

 down the back, is here represented by black on the face and 

 muzzle. 



General colour above blackish brown, profusely ticked with 

 buffy ; no dorsal dark line. Under surface with the throat 

 and chest ochraceous rufous, rather more rufous than the 

 tawny ochraceous of mimulus ; belly mixed ochraceous and 

 brownish ; outer side of hips more ochraceous. Centre of 

 face, over a triangular aiea extending from the tip of the 

 nose to just in front of the ears, deep glossy black in the most 

 typical specimens, though in some individuals it is ticked 

 with bufiy and more brownish. Cheeks brownish ochraceous. 

 Hands and feet brown, becoming rich ochraceous on the 

 digits. Tail-hairs mixed black and ochraceous. 



Skull a little larger than that of mimulus, but otherwise 

 similar. 



Dimensions of the type (measured in the flesh) : — 



Head and body 145 mm. ; tail 126; hind foot y8; ear 13'5. 



Skull : greatest length 40"3 ; basilar length 30 ; zygo- 

 matic breadth 24 ; length of upper tooth-series exclusive of 

 p^6-l. 



Hab. Cliocd, Western Colombia. Ti/pe from Sipi, R.io 

 Sipi, Rio San Juan. Alt. 150'. 



Type. Adult female. B.M. no. 9. 7. 17. 25. Original 

 number 123. Collected 24th September, 1908, by Mr. M. G. 

 Palmer. Eight specimens. 



This well-marked species, which I have named in honour 

 of its discoverer, who had already done good collecting work 

 in Nicaragua, is readily recognizable by the blackening of 

 its forehead and muzzle, which seems to take the place of the 

 black dorsal line in its nearest ally the Ecuadorean S. (M.) 

 mimulus. 



(Ecomys catherince, sp. n. 



Size largest of the genus. Fur soft and thick ; hairs of 

 back about 13 mm. in length. General colour above some 

 shade of fulvous, but the specimen has been discoloured and 

 probably rendered more strongly fulvous by spirit. Under 

 surface soiled whitish, not sharply defined laterally, the hairs 

 slaty for four-fifths their length, their tips dull buffy whitish 

 — in most (Ecomys the belly-hairs are white to their roots. 

 Head, arms, and legs grey. Hands brown on the middle of 



