GERBILLUS. R12 
SizE.—Head and body, about 53 inches; tail, 5 inches; length of 
fore-foot, o'5 inch; hind-foot, 1°4 inch. 
The peculiarity of the lobe, which was first detected by Mr. Oscar 
Fraser in removing a skull from a spirit specimen, distinguishes this 
species from the other Asiatic forms. There is also a peculiarity in the 
skull noticed by Mr. Blanford, which is that the lachrymal process, 
instead of being anchylosed to the adjoining bones, as in others of the 
genus, is free, and this species is therefore distinguished from the one 
most resembling it, G. wuguiculatus from Chinese Mongolia, in which 
the lachrymal process is united to the frontal. 
No. 320. GERBILLUS ERYTHRURUS. 
The Red-tailed Jerboa-Rat. 
Hasirat.—Afghanistan and Persia. 
DESCRIPTION.—Rufous brown above, with a few long black hairs, 
more numerous on the rump and thighs; under fur slaty ; under-parts 
white, gradually blending with the colour of the sides ; ears much larger 
than in the last species, hairy outside and near the margin inside ; soles 
of hind feet and toes thickly covered with hair, except on the hinder 
half of the tarsus ; tail very rufous—brown with a black tip, black hairs 
are scattered along the upper surface, and form a black band towards 
the end above, finally covering the whole tip. 
Size.—Head and body, about 6 inches ; tail, equal. 
Mr. Blanford, to whose ‘ Eastern Persia’ I am chiefly indebted for 
the above description, writes : “ From G. Hurriane, which Jerdon thought 
might probably be the same, the present form is distinguished by its 
much larger ears and by the hind feet, and especially the toes, being 
more thickly covered with hair beneath; the fur too is longer and tne 
colour browner on the back ; the tail is more rufous, and the tip blacker ; 
the skull is larger and broader; the nasal portion more elongate and 
less concave above, and the hind upper molar has a distinct talon, or 
rudimentary second transverse ridge, in young specimens, traces of which 
may be detected in the form of the worn tooth.” 
Its habits are similar to those of the last species. 
No. 321. GERBILLUS NANUS. 
The Dwarf Jerboa-Rat. 
Hasitrat.—Baluchistan. 
Descriprion.—The fur is soft and long, rufous brown or fawn colour 
above, white below, the colours being less sharply distinguished than in 
G. Indicus ; theshairs of the upper parts have no black tips, and the 
