1909.] COLLECTION OF MAMMALS FROM EGYPT. 793 



Colour above yellowish bufF, tlie bairs being slate-coloured at 

 their bases and with blackish tips. On the flanks the hairs are 

 white to their bases. The underparts, feet, sides of the face, a spot 

 above and behind each eye and behind each ear white. 



The skidl differs from that of henleyi in the larger size of the 

 buUfe and teeth, though the skull itself is but very little larger. 

 The bullse in size approximate to those of D. amoenas, a much 

 larger species. 



Measurements of type (in flesh): — Head and body 60 mm.; 

 tail 87; hind-foot 18 ; ear 8. 



iSkidl. Greatest length 21-5 mm.; basal length 19; greatest 

 breadth 12; length of palate from henselion 2; diastema 5; 

 greatest length of bullae 7 ; length of molar series 2" 7. 



Type. Coll. J. L. B. No. 288. Ad. Mokattam Hills near 

 Cairo, 25th March, 1909. 



One of the two specimens obtained was kept alive to ensure it 

 being full grown, but it unfoi'tunately escaped. 



Meriones crassus Sundevall. 



Iferiones crasstis Sundev. K. Vet.-Ak. Handl. p. 233, pi. 11. 

 fig. 4 (cranium) (1843). 



Me7'iones crassus sellysii Pomel, H. Schwann, Nov. Zool. xii. 

 p. 3 (1905). 



Four skins of a Merio7ies were brought back, two from Atbara,, 

 Sudan, where they were procured by Capt. Flower, and kept 

 alive in the Giza Gardens, and two that were brought in alive by 

 natives. It is impossible on this material, even combined with 

 that at the British Museum, to work out this very difficult group. 

 As they have large buUse I have provisionally placed them under 

 Sundevall's name, as the type of crassus came from Sinai. Those 

 from the Sudan appear to be rather larger and greyer in colour, 

 and have in life a rather more pointed snout. 



PsAMMOMYS OBESUS Oretzschm. 



Psammomys ohesus Cretzschm., Riipp. Atlas, p. 58, pi. 22 

 (1828) ; de "Wint. in Anders. Zool. Egypt, Mamm. p. 270 (1902). 



A single example of this form was given me by Dr. Todd, of 

 the Public Health Department. It belongs to the typical form, 

 and came from Abu Homos in the Delta near Alexandria, 



Mus RATTUS Linn. 



Mus rattus Linn. Syst. Nat. x. p. 61 (1758) ; deWint. in Anders. 

 Zool. Egypt, Mamm. p. 274 (1902). 



Mus alexandrinus Desm. Nouv. Diet. Hist. Nat. xxix. p. 47 

 (1819). 



Mus tectorial Savi, Nov. Giorn. Pisa, Feb. 1825. 



A very abundant species throughout the country. 



