Mammals from the Eastern Desert of Ejypt. 157 



Dimensions of the type (measured in the flesh) : — 



Forearm 46 mm. 



Head and body 53; tail 28; ear 22. 



Skull: front of canine to occiput 19; length in middle 

 line 16 ; front of bony palate to basion 12 5 ; breadth of 

 palate across vi? 7'5 ; tip of upper canine to tip of large pre- 

 molar 1*6 ; front of lower canine to back of m^ 8*3. 



Type. Male. Original number '2Q. Captured 3rd August, 

 1903. Four specimens. 



"Arabic name 'Wat-wat^; Bisharin name ' Humush- 

 Kilite.'^'— J. M. M. 



In the British Museum collection there is already a spirit- 

 specimen of this bat, obtained by Dr. J. Anderson at Gizeh. 

 This is the R. Antinorii of that naturalist\s ' Mammals of 

 Egypt,^ a note being appended by Mr. de Winton drawing 

 attention to its possible identity with R. clivosus. It is 

 certainly not R. Aniinorii^ whicli is larger in all ways and 

 has especially a much larger nose-leaf, the horseshoe of whicli 

 nearly covers the muzzle. 



With R. clivosus it has no doubt a nearer affinity^ but 

 seems to differ sufficiently by its different colour and the 

 constant absence of the minute premolars to be recognized as 

 a distinct species. I have also ventured to distinguish the 

 Kordofan bat described by Dobson under the name of 

 R. clivosus, as it has the small premolars quite separating 

 the canines from the large premolars. 



Whether the queer greenish colour of the two specimens of 

 R. Dobsoni (" sulphur- brown fibove, beneath canary-colour/' 

 Dobson) is natural or the result of defective preservation can 

 only be determined when further examples are obtained. 



Pipistrellus ariel, sp. n. 



A pigmy species of a very pale colour. 



Size very small, not exceeding that of P. nanus; form 

 slender, limb-bones unusually light and delicate. Fur long, 

 but not dense ; hairs of back rather over 7 mm. in length. 

 General colour above pale buffy, the slaty bases of the hairs 

 showing through ; below similar, but slightly paler. Mem- 

 branes pale brown, without lighter edging ; naked throughout, 

 except quite close to the body. Ears rather short ; inner 

 margin strongly convex below, with very small basal lobule, 

 slightly convex above ; tip rounded off; outer margin convex, 

 slightly above, strongly below, with a long, low, rounded 

 antitragal lobe. Tragus rather short, broadest rather above 

 its inner base, inner margin straight, tip rounded, outer 

 margin evenly convex ; basal lobule distinct, rounded. 



