424 



NOTES ON THE WINGLESS GRASSHOPPER. 



inches for the kind of grasshopper the protective was contrived against. 

 (See Fig. 3.*) Two inches, and other measurements, have been effect- 

 uallv tried; but the above width accomplishes the object with certainty, 



c*5 



if the protective is made with ordinary care. Of course, any width of 

 tin over two and a half inches is secure ; but this is the minimum that 

 will answer against the ordinary California wingless grasshopper. The 

 lath and tin fixed to the top of a board fence, or the tin alone made 

 three inches wide and tacked horizontally on the top of the fence, 

 answers completely. The most approved way for farms is to place the 

 contrivance (Fig. 1) inside the fence, and disconnected therefrom. 



* In this figure A represents the egg bag. 



