Temminck's Monographies de Mammalogie. 461 



in the Dys. tenuis, the two lateral ones are stronger than the 

 middle three, and possess a freer lateral motion. M. Temminck 

 therefore regards the Cheiromeles torquatus as a DysopeSy in which 

 this faculty has reached its maximum of developement. 



2. Dys. plicatus f the Vespertilio plicatus, Buchanan, Linn. 

 Trans. V. 261. 



3. Dys. Ruppelii. This new species is allied to the Nyclinomu$ 

 ^gyptiacuSj Geoff. Its size is that of the Vespertilio myotis. 

 Its ears are extremely large, conchiform, shadowing the face; 

 their internal margin not united, but projecting from the forehead 

 in a common base ; a strong internal fold covers the eyes ; the 

 base of tiie ear is furnished with an internal earlet, and with a 

 second external lenticular earlet : the tail is as long as the body 

 only, thick, and depressed, and scarcely one-half of it is enveloped 

 in the interfemoral membrane, which is destitute of muscular 

 fibres : the membranes of the wings are very long and narrow. 

 The fur is abundant, fine, closely-set, and smooth ; a broad bor- 

 der of closely-set hairs occupies the base of the wiiig-merabranes, 

 close to, and along, the sides of the body : the nose is covered by 

 black, scattered, diverging, hairs; the lips are broad, pendent, 

 and folded. The upper parts of the body are uniformly mouse- 

 coloured, and the under ones are somewhat paler: the toes are 

 covered with long, rather curved, whitish, silky, hairs ; and the 

 external one is somewhat more free than the others. It inhabits 

 Egypt. 



4. Dys. Geoffroyi: the Nyctinome d'Egypte (Nyctinomus 

 JEgypf.tacus, Geoff,,). In pursuance of his declared antipathy to 

 denominations derived from locality, M. Temminck has here 

 again ventured to set aside the original name. 



5. Dys. tenuis : the Nyctinomus tenuis of Dr. Horsfield. 

 ** Species which inhabit the New World. 



6. Dys. rufus, first indicated by M. Geoffroy Saint Hilaire in 

 the Annates du Museum, and since described by the Prince de 

 Neuwied as the Dys. perotis. In size it exceeds the Vespertilio. 

 myotis ; its nose is enormous, very thick and short, resembling in 

 some measure that of the Mastiff: its mouth opens widely : its 

 ears are considerably developed ; the interfemoral membrane is 



