234 U.S. NATIONAL MUSEUM BULLETIN 2 75 



Jaculus jaculus arenaceous, new subspecies 



Holotype. Adult male, skin and skull, USNM 322812, from Edri, 

 Fezzan Province, Libya; obtained Feb. 9, 1962, by G. L. Ranck, 

 original no. 1624. 



Specimens examined. Seventy-one, from Tripolitania: 2 km SW 

 Hun, 5; from Fezzan: Brach, 1; Edri, 23 (2 skeletons); Temenhint 

 Oasis, 30 km NE Sebha, 3 ; 4 km N Sebha, 1 ; 3 km NW Sebha, 2 ; 

 Sebha, 3; 7 km SW Sebha, 1; El Abiad, 60 km SW Sebha, 9; 75 km 

 W Ubari, 2; Murzuch, 5; 55 km SSW Serdeles, 7; El Gatrun, 3; 

 12 km N Ghat, 3; Ghat, 4. 



Measurements. Averages and extremes of 11 adult males and 8 

 adult females from the type locality, with the measurements of the 

 type in brackets, are, respectively: Total length 289 (279-307), 299.4 

 (288-308), [307]; length of tail 178.4 (160-200), 182 (172-189), [202]; 

 length of hind foot 63.2 (61-66), 63.3 (62-65), [65]; length of ear 21.9 

 (21-23), 21.8 (21-22), [23]; greatest length of skull 34.1 (33.5-34.7), 

 34.3 (32.9-34.8), [34.7]; condyloincisive length of skull 29.9 (28.9- 

 30.8), 30 (28.9-31.4), [30.6]; crown length of upper molariform 

 toothrow 5.2 (4.8-5.6), 5.3 (5.1-5.4), [5.3]; greatest breadth across 

 zygomatic processes 22.1 (21.3-23.6), 22.3 (21-22.8), [22.3]; least 

 interorbital breadth 12.4 (11.8-12.8), 12.4 (11.8-13.2), [12]; length 

 of nasals 12.6 (12-13.4), 12.8 (11.7-14), [14]; breadth of rostrum at 

 level of antorbital foramina 5 (4.8-5.2), 4.9 (4.7-5.3), [5] greatest 

 breadth of braincase 18.1 (17.3-18.7), 18 (17.5-18.7), [18]; greatest 

 breadth across antorbital processes 22.7 (22-23.4), 22.8 (21.7-23.7), 

 [22.3.] 



Diagnosis. Upperparts Light Pinkish Cinnamon becoming darker 

 posteriorly with strong admixture of brownish-tipped hairs causing a 

 markedly variegated appearance; rostral, mystacial, circumorbital, 

 postauricular, pectoral, and lateral areas Pale Ochraceous-Buff; 

 entire underparts, dorsal surface of fore and hind feet, and terminal 

 portion of tail white; forefeet naked ventrally and bearing five claws; 

 hind feet relatively large, heavily furred ventrally, artificially stained 

 Pale Yellow-Orange and with three toes; tail indistinctly bicolored 

 Pale Yellow-Orange dorsally and Light Buff ventrally, and ter- 

 minating in a distinct transversely bicolored pinna, Bister proximally 

 and white distally; pinna of ear Clay Color, sparsely haired with 

 fringe of buff-colored hairs on anteromedial margin. Skull: Large, 

 auditory bullae moderately large and inflated; zygomata convergent 

 anteriorly; pterygoid processes slightly divergent; nasals relatively 

 long; molariform toothrow relatively long. 



Comparisons. Jaculus jaculus arenaceous differs from the nominate 

 subspecies in greater overall length, less compacted skull, slightly 

 less vaulted braincase, more inflated bullae, larger infraorbital 



