FIELD NOTES ON SOME BRITISH MAMMALIA. 169 



evening ; I have seen several on the wing at 5.30 p.m., flying in 

 bright sunshine, and it goes to roost comparatively early, as I 

 have never seen it on the wing after 9.30 p.m. It disappeared 

 altogether after the end of August. That it hybernates at this 

 early date seems hardly possible, and I feel sure that it is to a 

 certain extent migratory, visiting other places. In supposition 

 of this I can only say that I had never seen this Bat in the village 

 of Milford, Surrey, until the year 1902, when I obtained a few 

 specimens in a hollow elm-tree formerly inhabited by a pair of 

 Barn-Owls. I did not see one during the summer of 1904, 

 whilst last year they were very common there. These Bats 

 have a strong and disagreeable odour, which is perceptible some 

 way off, and I have constantly " winded " them when passing 

 along a country road in the daytime. 



Pipisteellb (Vesperugo pipistrellus) . — This little Bat I do 

 not think hybernates at all in the true sense of the word, as 

 I have notes on its appearance in every month of the year, and 

 I have frequently observed it flying and catching gnats on a 

 winter's afternoon. It is remarkable how very easily these little 

 creatures are killed. One flew into my bedroom one evening, 

 and, wishing to keep it alive, I caught it in a butterfly-net, and 

 found, to my surprise and regret, on taking it out, that it was 

 quite dead. 



Daubenton's Bat (Myotis daubentoni). — As before stated in 

 ' The Zoologist,' a friend and I caught several of these Bats one 

 year at Teddington by angling for them over a bridge by the 

 river. The following year the same place was tried again, but 

 without success (A. H. Bishop, in lit.) ; not a single specimen 

 was seen or obtained. From this I conclude that this species is 

 migratory, and changes its quarters. I found them very regular 

 in their habits. They appeared flying over the water punctually 

 at 8 p.m., and their numbers gradually increased until 9 p.m., 

 when every one disappeared, and, although I waited quite two 

 hours, they did not put in another appearance that night. Not 

 only once, but several times this occurred. I never could dis- 

 cover the resting-places of this Bat — whether they resorted to 

 buildings or trees, though I think most probably it was the 

 latter. I did not observe them on the wing after September. 

 Their flight was very pretty, and quite unlike that of any other 



