RODENTS OF LIBYA 225 



Measurements. Measurements of the above specimens, an adult 

 male, 325806, and an adult female, 325819, are, respectively: Total 

 length 300, 312; length of tail 186, 195; length of hind foot 63, 60; 

 length of ear 24, 23; greatest length of skull 34.7, 33.8; condyloincisive 

 length of skull 30.5, 30.6; crown length of upper molariform toothrow 

 5.2, 5.5; greatest breadth across zygomatic processes 23.5, 23.2; least 

 interorbital breadth 13, 12.8; length of nasals 13.2, 12.5; breadth of 

 rostrum at level of antorbital foramina 5.5, 4.5; greatest breadth of 

 braincase 19.1, 18.5; greatest breadth across antorbital processes 24.4, 

 24.1. 



Diagnosis. Upperparts, including dorsum of tail, Avellaneous 

 becoming darker posteriorly owing to greater admixture of brown- 

 tipped hairs; interorbital and interauricular areas Cinnamon-Buff; 

 mystacial, suborbital, postauricular, and pectoral areas Light Buff*; 

 pinna of ears badly disfigured by ants, but remnants Clay Color; in 

 both specimens Plumbeous underfur exposed in large eroded patches 

 on dorsum behind ears; underparts white grading to Light Buff on 

 lateral margins; lateral margins of rump creamy and washed with 

 flecks of gray; prominent whitish bands on the posterolateral areas 

 of the rump converge medially onto the tail; fore and hind feet 

 white dorsally, forefeet naked ventrally; soles of hind feet heavily 

 furred ventrally with strong admixture of Light Pinkish Cinnamon; 

 tail prominently bicolored and pinnate, Avellaneous dorsally and 

 Pale Pinkish Buff ventrally; pinna Bister proximally and white 

 distally; vibrissae profuse and dark basally. Skull: Large for the 

 species; auditory bullae large and markedly inflated; zygomata 

 heavy, relatively flattened in profile; angular process of mandibles 

 fragile and with two distinct foramina of unequal size on anterior 

 margin. 



From near topotypes of the nominate subspecies from Biskra, 

 Algeria, these two specimens from Libya are larger in all external 

 measurements and cranial characters, being of comparable size only 

 in the length of the ears. 



These two specimens differ from Jaculus deserti schliiteri as known 

 from Feiran Oasis, Sinai, Egypt, as follows: Size: Smaller in all 

 external measurements, especially in length of hind foot and length 

 of ear. Skull: Smaller in greatest length, condyloincisive length, and 

 breadth of rostrum at level of antorbital foramina; larger in length 

 of molariform toothrow, least interorbital breadth, and size and 

 degree of inflation of auditory bullae. Color: Slightly paler and less 

 variegated dorsum, supraorbital and rostral areas more uniformly 

 colored Cinnamon Buff, and soles of feet with less suffusion of dark 

 hairs. 



