254 The Ohio Journal of Science [Vol. XX, No. 7, 



web consisted chiefly of grasshoppers, sucked the juice from five 

 fuU-grown grasshoppers in a week. Some of these grasshoppers 

 were larger than the spider itself. If on the two and one-half 

 acre tract mentioned the spiders fed on grasshoppers entirely 

 for one week and each destroyed five, there would be seven 

 hundred grasshoppers destroyed each week. This is a high 

 estimate perhaps because some spiders smaller than the one 

 referred to would not eat that number in a week's time. But 

 if the number were much less than seven hundred it is seen 

 that they would be of a considerable aid in keeping down 

 insects. 64% of the insects destroyed were of an injurious 

 character; 19% were of a beneficial nature, and 2% were 

 neither injurious nor beneficial to farm crops. The other 15% 

 represented a varied number of different insects, a few of which 

 were beneficial but the majority of which have no direct bearing 

 either way as regards farm crops. 



