﻿354 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



Measurements. — Averages and extremes of two males and two fe- 

 males from one-half mile east of Muntazah were, respectively : Total 

 length 222 (219-224), 215 (207-223) ; length of tail 122 (120-125), 



119 (113-125) ; length of hind foot 30 (30), 28 (27-29) ; length of ear 

 from notch 15.5 (15-16), 15.5 (15-16); occipitonasal length 29.1 

 (28.9-29.3), 28.2 (28.2); length of palate 12.95 (12.8-13.1), 12.5 

 (12.3-12.7) ; length of palatal foramina 5.5 (5.4-5.6), 5.2 (5.1-5.3) ; 

 length of auditory bulla 8.85 (8.8-8.9), 8.75 (8.7-8.8) ; crown length of 

 upper molar series 3.85 (3.8-3.9), 3.85 (3.8-3.9); least interorbital 

 width 5.9 (5.8-6.0), 5.75 (5.7-5.8). 



Remarks. — Gerhillus gerbiUus andersoni may be distinguished from 

 what is here considered the nominate race from 5 miles northwest of 

 the Pyramids of Giza by darker dorsal color and longer more pig- 

 mented ear. Cranially it may be distinguished by longer rostrum, 

 larger teeth, more inflated auditory bullae, longer, narrower braincase, 

 longer incisive foramina, and more robust zygomata. 



GERBILLUS GERBILLUS GERBILLUS (Olivier) 



Dipus gerUllus Ouvieb, Bull. Set. Soc. Philom. Paris, vol. 2, p. 121, 1801 (Giza 

 Province, Egypt). 



Specimens examined. — Thirty-seven. Giza Province: Abu Kau- 

 wash, 1 (MVZ) ; 5 miles east of Helipolis, 4; 8 miles east of Helipolis, 

 8 ; 5 miles northwest of Pyramids of Giza, 10 ; Saqqara, 2. Suez Canal 

 Zone : 3 miles northwest of Fayid, 12. 



Descnption. — Upper parts Pinkish Cinnamon, hairs plumbeous at 

 base, subterminal band of above color, minute terminal band of some 

 hairs blackish. Color purest on sides, flanks, cheeks, and nose; entire 

 underparts, muzzle, most of the vibrissae, hind and fore legs, dorsal 

 and ventral surfaces of hind and fore feet, supraorbital and postauric- 

 ular spots, white. Ears flesh-colored, nearly naked. Eye bordered 

 by narrow black ring. 



Measurements. — Averages and extremes of four males and six fe- 

 males from five miles northwest of the Pyramids of Giza were : Total 

 length 222 (216-227), 211 (203-217) ; length of tail 127 (123-131), 



120 (113-128) ; length of hind foot 30 (29-31), 28.5 (28-29) ; length 

 of ear from notch 12 (12), 12 (12); occipitonasal length 27.3 

 (27.2-27.4), 26.6 (26.2-26.8) ; length of palate 12.2 (12.1-12.5), 12.1 

 (11.7-12.5) ; length of palatal foramina 4.5 (4.3-4.6), 4.4 (4.3-4.6) ; 

 length of auditory bulla 8.7 (8.5-8.8), 8.4 (8.3-8.8) ; crown length of 

 upper molar series 3.45 (3.4-3.5) , 3.5 (3.4-3.6) ; least interorbital width 

 5.85 (5.8-5.9), .5.7 (5.4-6.0) ; weight 21 (19-22), 19 (18-21). 



Remarks. — This small gerbil, represented by 37 specimens, is re- 

 markably constant in measurement and color. In external measure- 

 ments it is about the same as Gerhillus gerhillus andersoni. The two 



