The Forms 0/ Jaculiis jaculiis in Eyypt and Syria. 295 



2 (1). rrothorux with front angles slightly 



rounded but porrect, hind angles rect- 

 angular and fairly sharp ; elytra with 

 moderately rounded shoulders, apex 

 scarcely emargiiiate, outer angle of 

 truncature rounded. 



3 (4). Eyes moderately prominent ; prothorax 



with hind angles projecting outwards, 

 base distinctly bordered ; elytra with 

 intervals 3-5-7 strongly carinate (at 

 least on basal half), surface very shiny . carlnaius, .sp. Ji. 

 4(3). Eyes flat; prothorax with hind angles 

 rectangular, but not projecting outwards, 

 base indistinctly bordered ; elytra with 

 intervals 3-5-7 generally convex (at least 

 on basal half), eurface dull to moderately 

 shiny Javimus, Klug. 



XXXVII. — The Forms 0/ Jaculus jaculus in Egypt and 

 Syria. By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



When working out Capt. Angus Buchanan's Air mammals 

 Mr. ilintoii and I found it advisable to divide the western 

 forms of Jaculus jaculus, by colour, into several ditFerent 

 races, and I have now had an opportunity to examine the 

 eastern ones in the same way. 



In the first place, it should be noted that the large form 

 described by me as Jaculus j. gordoni from Kordofan, and 

 hitherto assumed to range northwards to Khartoum, does not 

 really do so, as all the numerous Khartoum specimens now 

 available agree strictly in size with those from Lower Egypt. 

 In comparison with the series of skiill-lengths given by me 

 for Jerboas of this group in 1913*, those of half-a-dozen 

 Khartoum specimens are instructive — .32'5, 32'7, 33*2, 33*4, 

 33*6, 33*7 mm., — and show a practical identity with those of 

 Lower Egypt, thus indicating that they should not be 

 referred to gordorii, but to jaculus. 



Their colour, however, is of so uniformly darker, browner, 

 and richer a tone than the buffy Lower Egypt animals that 

 they should apparently be recognized as subspecifically 

 distinct. 



* Ann. & Mag. Nat. Hist. (8) xi. p. 484 (1913). 



