21 



clfic distinction of this animal, is the probability of its being the 

 male of that described by Dr. Harlan under the name of //. nujer. 

 The hair of the forehead and head in general is directed backwards, 

 towards the neck : that on the crown of the head is very long, and 

 gives to the head that pyramidal or conical form before mentioned. 



The skeleton and dentition show it to have been a young animal ; 

 the permanent teeth had not yet protruded from the alveoli. The 

 total length of the skull (from the intermaxiUaries to the occiput) is 

 4 inches ; its greatest width is 2 inches 7| lines ; width between the 

 outer boundaries of the orbits, 2 inches ; from base of nasal bones to 

 apex of intermaxiUaries, 1 inch 1^ lines. The length of the hume- 

 rus is 7 inches 2 lines ; of the ulna, 8 inches ; radius, 7 inches 7 lines ; 

 femur, 6 inches ; tibia, 5 inches 3 lines ; fibula, 5 inches 1 line. 



The principal external characters of this animal may be thus ex- 

 pressed : 



Hylobates leucogenys. Hyl. niger ; pilis ad latera faciei et ad 

 gulam albis ; pilis verticis longis et semi-erectis. 



Mr. Waterhouse exhibited a new species of Squirrel from the So- 

 ciety's collection, and pointed out its distinguishing characters, which 

 are as follows : — 



SciuRus DiMiDiATus. Sci. suprd, griseus fulvo lavatus, subtiis fla- 

 vus ; capite, corpore ad latera pedihisque rufesceiiti.bus ; caudd 

 fere corporis longitudinevi aquante, indiitd pilis nigris,flavis atque 

 fulvis commixtis. 



une. lin. 



Longitudo ab apice rostri ad caudse basin 10 



caudce, fere 7 6 



ab apice rostri ad basin auris 1 11 



tarsi digitorumque 2 3 



auris 8 



Hab. South America ? 



This curiously-coloured species of Squirrel was purchased at a 

 sale, and in the same lot were specimens of Sciurus (Estuans and Sc. 

 Langsdorffii, well known South American species; it is probable, 

 therefore, it may be an inhabitant of the same country. Its fur is 

 very short for a Squirrel, rather harsh, and less loose than in the 

 generality of Squirrels : the back is gray, or what might be termed an 

 iron-gray, having a rusty hue ; on the upper part of the head the 

 rust-like tint prevails, and the muzzle is almost entirely of a rich 

 rust colour ; the sides of the head and neck are of a golden-yellow 

 tint, and the under parts of the body are yellow : a bright rust- 

 coloured line runs along each side of the body, and separates the 

 yellow colouring of the under parts from the iron -gray of the upper : 

 on the outer sides of the limbs, and on the feet, a rich deep golden- 

 yellow hue prevails. The tail is apparently cylindrical, and not 

 bushy ; the prevailing hue of the hairs is deep rust colour, but they 

 are for the most part more or less broadly annulated with black in 

 the middle. The ears are slightly pointed, and well clothed with 



