Mammals from Lake Ngamiy ttr. 395 



Dimensions of tlie type (moasiired in tlic flesh) : — 



Head und body 1'65 nun. ; tail 152 ; hind foot 32 ; ear 24-5. 



Skull : greatest length 40 ; basal length 34*2 ; condylo- 

 basal length 3G ; basilar length 31; zygomatic breadth 21'4 ; 

 breadth of brain-case across squamosal region 16*3 ; inter- 

 orbital breadth 0'2 ; nasals, greatest length IG'i), greatest 

 breadth 4, least breadth 2-8; palatal length 21*2; jjahitilar 

 length 18; width of palate inside m'3'9; width of palate 

 outside 7?i' 9 ; length of palatal foramina 7 ; post-j)alatal 

 length 13*4; length of upper cheek-teeth 6"7. 



I/ab. East bank of the Tainalakan Uiver, Ngamiland. 

 Altitude 3700 feet. 



Ti/j>e. Adult female. B.M. no. 10. G. 3. 25. Original 

 number 64. Collected July 26th, 1909. 



The very much lighter colour of the pelage indicates that 

 this Gerbil must be regarded as distinct from the South 

 African T. brantU. It would appear to be a desert form of 

 that species, and as such deserving of subspecific rank. 



" I noticed nothing in the habits of this Gerbil to 

 differentiate it from the other species." 



13. Desmoddlus auricidaris pudicus, subsp. n. 



? . 27 ; ? (in spirit). Lehutitung, Kalahari. 



A bufY-coloured race of Desmodillus auricularis, Smith. 



Size and proportions as in 1). auricularis. General colour 

 of dorsal surface yellowish sandy red (between dark fawn 

 no. 1 and buff no. 1, 'Repertoire de Couleurs'). Flanks 

 rather j)urer and brighter in colour (buff no. 1, ' Repertoire '). 

 Individual hairs of back with slate-grey bases and light, 

 yellowish-buif tips, some of the hairs, down the middle of 

 the back, with the extreme tips dark brown. Face between 

 eyes and nasal region similar in colour to flanks. Cheeks 

 pale yellowish red, becoming pure white on the upper lip 

 and sides of neck. White patches behind ears as in 

 ]J. auricidaris. Backs of hands and feet covered with 

 short white hairs. Entire underparts white; hairs on belly 

 white throughout. Tail yellowish red above, paler and 

 whiter towards the tip; under surface white. 



Skull as in I), auricularis. 



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



Head and body 108 mm.; tail 92; hind foot 24; ear 

 13-5. 



Skull: greatest length 37; basilar length 27-7; con- 

 dylo-basal length 29'8; zygomatic breadth 18; breadth 

 of brain-case across squamosal region 16 ; interorbital 



