( 285 ) 



liulliie was I'ouinl, it mij^lit belong to this species. The bullae extend something 

 lilve 2 millimetres behind tlie occiput ; this is therefore not qnite so much as 

 is found in the specimens from Tripoli referred b\' Mr. Oldtield Thomas (P.Z.S. 

 10(12. Vol. II. Part I. p. 9) to M. schousboei. The habits of these nearly allied 

 forms with such marked differences in the development of the auditory chambers 

 will provide very interesting material for field naturalists. 



12. Pachyuromys dupresi natronensis subsp. nov. 

 (Plate VIII. fig. 3.) 



No. 99, c?,Bir Victoria, March 4th, 19U3 ; No. 102, 6, Bir Victoria, March 5th ; 

 No. 106, ?, Bir Victoria, March 8th. 



This is another addition to the fauna of Egypt, and e.Ktends the range of the genus 

 eastwards from Tunisia. This Egyptian form is so striking in its delicate pale 

 coloration that I think it well worthy of subsiiecific rank. Possibly distinguishing 

 characters will be found in the skulls when better material can be obtained of the 

 typical form for com])arison. 



The auditory chamber is so enormously enlarged in these animals that the 

 bones are almost in contact above and below the foramen magnum. One specimen 

 has a sinus about 2 millimetres in extent in the base of the organ, and I have 

 noticed similar malformation in other specimeus. 



An inquiry of great interest might be made as to the cause of the extraordinary 

 enlargement in the auditory chambers in so many different orders of animals which 

 live in sandy districts : notably Foxes, Hedgehogs, aud these Gerbilines. 



13. Jaculus jaculus Linnaeus. 



No. 7, (J, Zaghig, February 22ud, 1903; No. 87, S, Zaghig, March 1st; 

 No. 90, 92, S6, Zaghig, March 3rd ; Nos. 110, 111, <?<?, Bir Victoria, Blarch 

 9tb, 1903. 



14. Lepus rothschildi de Winton. 



Nos. 4, 5, 6, (J c?, Wardan, February 22nd, 1903 ; No. 16, <?, Zaghig, March 

 23rd; No. 70, c?, Zaghig, February 7th ; No. 109, S, Bir Victoria, March .5th ; 

 No. 89, no sex, Zaghig, February 1st; No. 3, ?, Wardan, February 22ud ; 

 No. 21, ?, Zaghig, February 27th; Nos. 63, 64, ? ?, Zaghig, February 25th ; 

 No. 103, ?, Bir Victoria, March 5th. 



" This species, judging from the numerous footmarks, is fairly common throughout 

 the Wady. It also extends south of the Wady, and is found close to Wardan 

 (Station. Wardan is a well-known game preserve, and it is most probable that the 

 specimens of this hare, which from time to time reach tJairo iu the fiesh, are sent 

 there by rail by native shikaris who have secured them near Wardan Station, 

 which is barely an hour from (!airo by train." — N. G. K. & F. K. H. 



The specimens in this collection are rather more rufous in general colour than 

 those obtained by Mr. Rothschild on a former occasion, but for which the exact 

 locality was not known. This is possibly a seasonal change. 



