324 bulletin: museum of comparative zoology. 



It is only after much deliberation that I have decided to refer these 

 specimens to revoili described by Robin from Somaliland. They seem 

 to be smaller than Dobson's aethiopica, a species to which they are 

 apparently closely related. The type locality of the latter is Kordofan 

 in the Sudan Province, whence Dobson had three skins. No com- 

 plete measurements of aethiopica are available. Dobson's specimens 

 seem to have lacked the forearm bones, and his subsequent details of a 

 Zanzibar specimen (Rept. Brit. Assoc. Adv. Sci., 1881, p. 14) refer in 

 reality to the race luteola Thomas. The type of this last is from 

 Kitui, British East Africa, but Thomas states that Zanzibar specimens 

 are identical. It is slightly larger and yellower than typical aethiopica. 

 Such measurements as Dobson gives for the type of the latter (Cat. 

 Chiroptera Brit. Mus., 1878, p. 165) are all larger than those of our 

 specimens, and his statement that the fur of the chest and abdomen 

 varies from "yellowish white to pure snow-white" is hardly applicable, 

 for in our series of three skins these parts are uniformly pale drab, with 

 darker gray bases to the hairs. Robin says of his revoili that the belly 

 is whitish. His detailed measurements, however, agree very closely 

 with those of our bat, and are certainly much less than those of the 

 East African luteola, the type locality of which is hardly 150 miles 

 from the Guaso Nyiro. Probably this is another instance of a species 

 of the Abyssinian fauna reaching its southern limit along this stream. 

 The cranial measurements, of which none are published, are as 

 follows-, from no. 8274: greatest length, 19; basal length, 15; palatal 

 length, 4.3; greatest frontal width, 7.8; mastoid width, 8.3; upper 

 tooth-row, exclusive of incisors, 6.5; lower tooth row, exclusive of 

 incisors, 7; mandible, 12.3. The upper incisors are bifid, and a space 

 separates the pairs of opposite sides from each other and from the 

 canines. 



The forearm measures (no. 8871) 42 mm.; tibia, 22; calcar, 15.5; 

 Robin gives 44, 22, 17 respectively for these dimensions in revoili. 

 The tail in our three specimens measured in the flesh, varies from 51 

 to 53 mm.; Robin gives 51. 



MEGADERMIDAE. 



Lavia frons frons (Geoffroy). 



Megaderma frons E. Geoffroy, Ann. Mus. Nat. Hist. Paris, 1810, 15, 

 p. 192. 



Messrs. Andersen and Wroughton (Ann. Mag. Nat. Hist., 1907, 

 ser. 7, 19, p. 138) consider Lavia rex Miller, based on German East 



