76 l^fr. 0. Tliomas on Three new 



12-15 smooth scales from eye to ej'e across the 

 forehead ; rostral with an<.mlar horizontal edge ; 

 scales iu 47-53 rows G. thebaicus, Reuss. 



B. Scales smooth, in 41-45 rows ; tail ending 

 in a cm'ved, claw-like scute ; 5 smooth 

 scales from eye to eye across the forehead. G. MueUeri, Blgr. 



XI. — Descriptions of Three new Gerbilles in the British 

 Museum Collection. By Oldfield Thomas. 



Gerhillus calurus, sp. n. 



Size medium. Ears rather large, laid forward they reach 

 1 millim. in front of the anterior canthus of the eye. Mammae, 

 as usual, 2 — 2 = 8. Palms naked, with the usual five pads, 

 the two large basal ones subequal in size. Soles quite naked, 

 the proximal halves smooth and shining, the distal halves 

 very coarsely granulated and bearing six large and prominent 

 pads. Tail considerably longer than the head and body, 

 even without its terminal tuft of hairs ; coarsely scaly, the 

 rings of scales averaging about fourteen to the centimetre ; 

 thickly clothed all round with long coarse hairs 13 to 18 

 millim. in length from within an inch of its base to its tip, the 

 whole tail being as bushy as in many Myoxida3 ; its colour 

 apparently has been a dark rich brown or black throughout 

 its length, except at its tip, where the terminal half-inch is 

 white or yellow. 



Colour of the body apparently as usual in the genus, 

 yellowish or rufous above and whitish below, but, like the 

 colours of the tail, they must be taken with great reserva- 

 tion, as the only specimen is in a very bad condition and has 

 been at least fifty years in spirit. 



Skull with a long, slender muzzle, narrow interorbital 

 region, large bullas, whose posterior portion is much swollen 

 and appears in an upper view of the skull, and projects poste- 

 riorly just beyond the level of the occipital bone. 



Upper incisors bevelled, with a single deep groove. Molars 

 of the type so worn that the three lamiuie of ^ are connected 

 by two central bridges ; these two bridges are, however, not 

 directly in front of one another, the anterior being at a 

 markedly more internal level than the posterior. As far, 

 however, as can be judged in the present state of wear, the 

 teeth are decidedly those of Gerhillus {s. s.), and not of the 

 Meriones section of the group. Lamina} as usual 3 — 2 — 1 



