RODENTS OF LIBYA 245 



ments of an adult male, 325835, from 20 kilometers east of Rumia, 

 Tripolitania Province, are, respectively; Total length 370.7 (354-382), 

 361 (354-372), 362; length of tail 222.1 (204-230), 215.5 (214-217), 

 210; length of hind foot 76.5 (75-78), 73.5 (71-76) 79; length of ear 

 from notch 32.8 (30-36), 31.5 (30-35) 30; greatest length of skull 38.4 

 (36.6-39.4), 37.9 (37.2-39.2), 38.1; condyloincisive length of skull 35 

 (33.7-36.1), 34.8 (34.6-35.1), 35.1; crown length of upper molariform 

 toothrow 5.9 (5.5-6.1), 6.1 (6.1-6.2), 6.5; least interorbital breadth 

 14.1 (13.6-15.1), 14.2 (13.8-14.6), 14.4; length of nasals 14.8 (13.9- 

 15.6), 13.8 (13.6-14.2), 14.5; breadth of rostrum at level of ant- 

 orbital foramina 5.8 (5.4-6.4), 5.5 (5.2-5.9), 6.3; greatest breadth of 

 braincase 20.4 (19.4-21.2), 20.4 (19.8-21.1), 20.8; greatest breadth 

 across antorbital processes 27.7 (25.4-29.1), 27.5 (27.2-28), 28.1. 



Diagnosis. Upperparts and flanks Clay Color with strong suffusion 

 of dark hairs resulting in a streaked or marbled appearance; this effect 

 more prominent on rump; sides, ventrolateral and scapular areas 

 Pinkish Buff with strong admixture of brownish-black hairs; under- 

 pays and forearms white but suffused with Pale Pinkish Buff; sub- 

 auricular, postauricular, and postorbital areas Cinnamon-Buff grading 

 to Pale Pinkish Buff in circumorbital and mystacial areas; all areas, 

 except those which are white, with strong admixture of black hairs; 

 pinnae of ears sparsely haired and Sepia on internal and lateral 

 aspects, Tawny Olive on medial margin; vibrissae long, proximally 

 dark in color (Fuscous) and white distally; forelegs and hindlegs 

 sparsely haired and whitish dorsally; fore feet naked ventrally and 

 bearing five claws; hind feet bearing three claws, heavily furred 

 ventrally with dark hairs (Clove Brown) concentrated on sole and 

 extending along ventral surface of metatarsus; digital areas Pale 

 Pinkish Buff; tail indistinctly bicolored Clay Color dorsally and Light 

 Buff ventrally with terminal pinna, transversely bicolored, Fuscous 

 Black proximally and white distally. Skull: Large and robust; brain- 

 case slightly vaulted; molariform teeth large; zygomata heavy and 

 bearing large, winglike antorbital processes; auditory bullae mod- 

 erately large; anterior palatine foramina expanded posteriorly and 

 laterally; nasals flaring anteriorly; rostrum relatively wide and heavy; 

 angular process of mandible with large, single oval foramen on its 

 anterolateral surface. 



Comparisons. From Jaculus orientalis orientalis, as known from 

 Mersa Matruh, Western Desert Governorate, Egypt, the series from 

 Gheminez differs in having slightly larger size of most external and 

 cranial measurements but in being smaller or of comparable size in 

 length of ears and breadth of rostrum at level of antorbital foramina. 

 Jerboas from Gheminez also have slightly larger lachrymals, and the 

 anterior palatine foramina are less expanded posteriorly. The two 



