84 



The Irish NatiiralisL 



April, 



in this fashion one has almost to tread on him first. And 

 this, I think, explains why there are many warm nights in 

 my table on which no Frogs were noted, though very few 

 (and of these few nearly all were wet or windy) on which there 

 were no Bats. 



As I have not learnt to distinguish the Whiskered Bat 

 ( Vespcrtilio mystacmus) from the Pipistrelle or Common Bat 

 (Vcspemgo pipist?'ellus) on the wing, it is possible that a few 

 individuals of the former species, which occurs at Bally- 

 hyland (see hish Naturalist^ vol. xi., p. 103), have been noted 

 in my table as Pipistrelles ; but this would not affect the 

 general result. On January 21st, 1902, I examined, as 

 already recorded, a Whiskered Bat caught flying at a tem- 

 perature of 48°, and the Long-eared Bat often flies (but 

 generally evades observation) at 46^. Most of the Bats s^en 

 at low temperatures can, however, be none other than the 

 Pipistrelle, and I saw an example of this species capttired at 

 43j° on the evening of December 28th, 1901. The Hairj^-armed 

 Bat ( Vesperugo leisleri). whose haunts were often visited on 

 warm evenings, was not seen by me at all during the period 

 of these observations ; and it may be concluded that this 

 remarkably somnolent animal, which even in its season of 

 activity sleeps for 21 J hours in the 24, is little addicted to 

 winter flight. 



TABIvE. 



A record of the Bats, Hedgehogs, and Frogs observed between October 



26th, 1901, and February 28th, 1902, with a note of the temperature 



of each evening, read half an hour after sunset. 

 The letter N. (signifying "numerous") is used where at least six 



individuals of a species were seen. NN. is used to signify "very 



numerous." 



