144 U.S. NATIONAL MUSEUM BULLETIN 275 



of hindlegs and thighs with conspicuous plumbeous-colored patches, 

 fore and hind feet naked ventrally, each with five digits with claws; 

 vibrissae relatively long and formed of equal numbers of light and dark 

 hairs; ears long, sparsely haired, Ochraceous-Buff basally and Brown- 

 ish Olive distally and with distinct tuft of buffy hairs on anteroventral 

 margin; tail prominently bicolored, dorsally same color as dorsum, 

 but with stronger suffusions of brown hairs, ventrally almost white; 

 tail with indistinct pencil; immature specimens of this subspecies 

 markedly paler and more uniform in dorsal color, approaching 

 Cinnamon-Buff, and lacking the strong suffusions of dark hairs. 

 Skull: Large and robust; molariform teeth large; auditory bullae 

 moderately inflated; anterior palatine foramina wide; zygomatic 

 breadth wide; nasals long and posterior palatine canals wide and 

 conspicuous. 



Comparisons. From topotypes of Gerbillus campestris haymani 

 from Siwa Oasis, Western Desert Governorate, Egypt, this specimen 

 from Bardia differs in darker dorsal color with stronger suffusion of 

 brown, markedly shorter and more prominently bicolored tail with a 

 much reduced terminal brush, smaller auditory bullae, and smaller 

 size of all other cranial details, being of comparable size only in the 

 crown length of the molariform too throw. 



Compared to topotypes of Gerbillus campestris dodsoni from Ain 

 Hammam, Tripolitania Province, Libya, this specimen from Bardia is 

 paler and more uniform in dorsal color, has markedly smaller auditory 

 bullae, wider interorbital breadth and rostrum, and less conspicuously 

 tufted tail. 



For comparisons with Gerbillus campestris brunnescens and Ger- 

 billus campestris patrizii, see accounts of those subspecies. 



Remarks. This specimen from Bardia differs from typical G. c. 

 wassifi from Salum, Egypt, in having larger hind feet, a less promi- 

 nently tufted tail, more grayish hairs on the head, slightly smaller 

 auditory bullae, and slightly narrower anterior palatine foramina. In 

 view of the geographic proximity of Bardia to the type locality of 

 wassifi in Egypt and the continuity of habitat between them, even 

 these subtle differences would not be expected. Thus, this single speci- 

 men may not possess characters typical of the whole population. These 

 differences do not depart markedly from those considered typical for 

 G. c. wassifi, and specimens from Libya are included with this 

 subspecies. 



In reviewing the dipodils of Egypt, Wassif (1956) assigned speci- 

 mens from coastal Egypt to Gerbillus campestris campestris; the type 

 locality of which is far to the west at Philippeville in the Province of 

 Constantine on the Algerian Coast. He had no specimens of typical 

 G. c. dodsoni but referred gerbils from Siwa Oasis, Egypt, to this 

 subspecies. 



