The Forms of Jaculus jaculus in Egypt and Syria. 295 
2 (1). Prothorax with front angles slightly 
rounded but porrect, hind angles rect- 
angular and fairly sharp; elytra with 
moderately rounded shoulders, apex 
scarcely emarginate, 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 . carinatus, sp. Nn. 
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), surface dull to moderately 
RIDGE eee rster see euaceteee uth: sisi hi sr bp a armnet Os Javanus, Klug. 
XXXVII.— The Forms of Jaculus jaculus in Egypt and 
Syria. By OLDFIELD ‘THOMAS. 
(Published by permission of the Trustees of the British Museum.) 
WuHeEN working out Capt. Angus Buchanan’s Air mammals 
Mr. Hinton and I found it advisable to divide the western 
forms of Jaculus jaculus, by colour, into several different 
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 Kordotan, 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 skull-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 gordoni, 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). 
