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Five Species of Vcspertilio. 63 



Professor J. Green, has given in Doughty's Cabinet of 

 Natural History some interesting particulars concerning a 

 small species of Bat, V. domesticus, which appears from his 

 description to be identical with this. He observed it to resort 

 in great numbers to a deserted frame building, concealing itself 

 during the day between the boards and the plaster walls, all 

 entering and issuing by one small aperture. This was in 

 western Pennsylvania. 



I here wish to corroborate the remark of Professor Green, 

 that the number of incisors, at least in our Bats, is a permanent 

 character. I have seen nothing to favor the idea entertained 

 by several distinguished naturalists, that any of the teeth are 

 deciduous, but on the contrary have observed them to retain 

 the entire number until quite worn with use. 





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