Anali/tkal Notices of Books, 561 



as long as the body, exclusive of the head, enveloped with the 

 iuterfemoral membrane, excepting about one line of the tip which 

 is naked. Flying-membrane of a dark brown colour : interfemoral 

 membrane capable of great expansion by lateral cartilages, very 

 gradually attenuated to a very short apex. 



The head and body are covered with a very short delicate fur of 

 a dark brown colour on the upper parts, paler and inclining to 

 gray underneath. The tint is deepest on the head, and on the 

 highest part of the back, along the spine. The claws of the pos- 

 terior extremities are comparatively broad. 



One specimen only of this species of Vespertilio, has as yet 

 been obtained, and a more complete detail of its peculiarities re- 

 mains to be given in one of our future numbers. 



Of the various species of this genus, which have hitherto been 

 described, our animal most nearly resembles the V. piplstrellus. 

 But it differs in various particulars. It is not only considerably 

 smaller in its dimensions, but it is also distinguished by the form of 

 the tragus which is linear and simple, and by the tip of the tail 

 which is naked, and projects slightly beyond the interfemoral 

 membrane. The relative proportions of its head, body, and tail, 

 are also different. The indication of an Egyptian variety jjf the 

 Vespertilio pipistrellus by Geoffroy, which Desmarest is inclined to 

 consider a distinct species, renders it probable, that the smaller 

 Vespertiliones, even in Europe and the neighbouring territories, 

 are not as yet examined with sufficient accuracy, and that new 

 species, allied to each other in external appearance, remain to be 

 discovered. 



Art. LXIX. Analytical Notices of Books. 



The Transactions of the Linnean Society/ of London. Vol. 

 xiv. Part the Second, 4lo, pp. 223. (171—394.) With 

 fve Plates. 

 The Papers contained in the present portion of a volume era- 

 brace the proceedings of the Linnean Society, during 1823, and 



