156 Mr. 0. Tliorna? on some 



to be of much interest ; for even witli the magnificent accession 

 to our knowledge of tlie mammals of Egypt represented by 

 the late Dr. Anderson's work on the subject, this eastern 

 desert has by no means been worked out, and Mr. Mackillio-jn 

 has now discovered two new species, a bat and a gerbille, 

 while an examination of his specimens of another bat, already 

 obtained by Dr. Anderson, show this also to need a special 

 name. 



Besides the species described in detail below Mr. Mackilligin 

 obtained in the same district examples of Asellia trideyis^ 

 Gerbillus gerbillus, Acomys sp., and Jaculas jacalas. 



Rhinolophus Andersoni, sp. n. 



Ithiiiulophiis Antinorii, Anderson and de Wiuton, Mamui. Egypt, p. 96, 

 pi. xvi. fig. 2 (1902) (nee Dobs.). 



Allied to E. cUvosus, Riipp., but with no small anterior 

 premolars and different colour. 



General characters as in B. clivosus, the nose -leaf and cars 

 being apparently very much as in that species * ; perhaps 

 the front face of the median vertical process is slightly more 

 narrowed upwards, but the difference is very slight ; horseshoe 

 small, not covering the muzzle laterally. Wings from the 

 ankles. 



Colour drab-grey, the hairs above slightly darkened ter- 

 minally, those of the belly drab-grey throughout. In R. cU- 

 vosus the belly is white. Membranes transparent greyisli, 

 rather darker along the centres of the digital interspaces. 



Skull with a broader heavier muzzle and nasal region than 

 in E. Dohsoni (the bat considered by Dobson as E.clivosus f) 

 or than in E. euryale. 



Small premolars, both upper and lower, absent in every 

 specimen, the large upper premolar pressed close against, 

 even overlapping, the canine. In E. clivosus the small 

 premolars are present both above and below. 



* Figure of the type given by Peters, Von der Decken's Reiso, Saug. 

 pi. ii. (1869). 



f Rhinolophus Dobsoni, sp. n. 



Ehinolophihs cUvosus, Dobs. Cat. p. 1:^0 (nee lUijipell). 



Type. Specimen 6. $. B.M. no. 47. 5. 7. 49. (Forearm 44 mm.) 



Hub. Kordofan. 



As Peters has shown, the true R. cHvosus of Riippell, from Mohila, 

 Arabia, is one of the group with the large upper premolar pressed close 

 against the canine, the small premolar being in the outer angle. lu 

 Dobson's bat, on the other hand, although he puts it in the same group, 

 the anterior premolar separates the second premolar from the canine. 

 This difference cannot be due, as he supposed, to immaturity, one of the 

 specimens at leatt being fully adult. 



