HEARING IN INSECTS, 77 



months is by no means sparing of its stridulous 

 music, instantly ceases to crink the moment it hears a 

 foot fall ; and hence it is not easy to discover the spot 

 where it is, unless it be approached in the most cau- 

 tious manner, for it is silent if a person approach 

 within several yards of it. Brunelli, an Italian 

 naturalist, tried some experiments upon this insect, 

 more satisfactory than the preceding ones of Bonnet. 

 He kept several in a chamber, which continued their 

 crinking song through the whole day ; but the instant 

 they heard a knock at the door, they were silent. 



Green field cricket (Acrida viridissima'), with its nest and e 



H 3 



