304 Zoological Society, 



total length of the skull (from the intermaxillaries 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 intermaxillaries, 1 inch 1§ line. 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- 



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 : — 



Sciurtjs dimidiatus. Sci. suprd, griseus fulvo lavatus, subtus fla- 

 vus ; capite, corpore ad latera pedibusque rufescentibus ; caudd 

 fere corporis longitudinem cequante, indutd pilis nigris,flavis at que 

 fulvis commixtis. 



unc. 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 cestuans and Sc. 

 Langsdorjjii, 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 

 golden-yellow hairs ; those on the outer side are of a bright rust 

 colour ; they have no pencil of hairs at the tip. The hairs of the 

 moustaches are numerous, long, and of a black colour. The incisors 

 of both upper and under jaws are deep orange. 



Mr. Fraser read his descriptions of, and observations upon, some 

 new species of Insessorial Birds, belonging to the genus Agrilorhinus. 



" In the northern parts of South America and in Mexico," Mr. 

 Fraser observed, " are certain small birds, resembling the Warblers 



