On a neio Species r)/ Amastra. 159 



•witliont black intermixture ; under surface pure wliite, the 

 line of demarcation not very sharply defined. Supraorbital 

 and postocular white spots present, but not particularly con- 

 spicuous; ears decidedly shorter t\\2in\x\ D. famulus. Outer 

 side of arms and legs like body, inner white ; upper surface 

 of hands and feet white; palms and soles wholly naked; 

 ])ads of sole six, as usual, but the hallucal one jammed close 

 up to the three terminal pads, the hallux itself being appa- 

 rently set on rather more distally than usual. Tail long, its 

 liairs gradually lengthening terminally into a conspicuous 

 blackisli pencil, the hairs of which may attain to 13 mm. in 

 length ; brown above, darkening on the pencil to black, dull 

 fawn below proximally, the terminal half dark all round. 



Skull conspicuously smaller than that of I), famulus, the 

 bullse also smaller in proportion and less elongated anteriorly. 

 Teeth with the characteristic Dipodillus pattern, the middle 

 inner lobe of m^ half anterior to the outer lobe. 



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



Head and body 78 mm. ; tail 138; hind foot 24; ear 14. 



Skull: greatest length 27; basilar length 19*G ; nasals, 

 length 10 ; interorbital breadth 4'8 ; breadth of brain-case 

 12*6 ; diastema 7; length of bulla 10 ; length of upper molar 

 series 3"6. 



Hah. Wady Alagi, Eastern Egyptian desert, hit 22^ N., 

 long. 35° E. Alt. 2000 feet. 



Type. Adult female. Original number 35. Collected 9th 

 October, 1903. Four specimens. 



This very pretty pencil-tailed gerbille is quite unlike any- 

 thing hitherto described from Egypt, its nearest ally appearing 

 to be the much larger D. famulus of Aden. 



XXV. — On n •new Species of A\n?^?,\vn from the Haicaiiati 

 Idands. By E. II. Sykes, B.A. 



Amastra yKaua'ut) reXy sp. n. 



Shell much depressed, heliciform ; umbilicus deep, of 

 moderate size ; dark horn-colour, strongly rugosely striated, 

 with a fairly large protoconch ; whorls five, increasing 

 regularly, plano-convex, the suture being impressed and 

 well marked ; the last whorl is carinate, flattened above 

 and somewhat inflated at the base; at the periphery the peri- 

 ostracum is exaggerated into a produced layer, from which 



