216 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 4 



The difference in the numbers collected from the two plots was so 

 apparent, from the first, that a yard of the soil adjacent to each of the 

 screened beds was sifted to determine the relative position of the 

 pupae in the plowed and the unplowed soil. The first and second three 

 inches of soil were sifted separately. The numbers of pupae found are 

 recorded in the following table. 



It should be noted that in the square yard of plowed soil only 37.2 

 per cent of the pupae were found in the first three inches, while in the 

 unplowed plot 93 per cent were found in the first three inches. 



It seems hardly possible that the facts as presented could be ac- 

 counted for, other than the direct effect of cultivation. Prior to this 

 experiment the two plots were covered with seedlings at the rate of 

 200 or more per square yard and these were either killed or their roots 

 so badly injured that they were unfit for use. For this reason it is 

 thought that the numbers of pupae in the two plots must have been 

 approximately equal before the ground was plowed. 



OVIPOSITION AMONG TREE-CRICKETS 



By P. J. Parrott 



In the Journal of Economic Entomology, Vol. 2, pp. 124-127, 

 a brief account was given of the work of Oecanthus niveus De 

 Geer on apples, and 0. nigricornis Walker on raspberries. The present 

 paper deals with observations on the egg-laying habits of these species 

 and of 0. quadripundatus Beut. The' crickets on which these studies 

 were made were captured in the same raspberry planting, and single 

 pairs of each species were confined in breeding cages in which were 

 growing both apples and raspberries. The number under observation 

 were ten pairs of niveus, six pairs of nigricornis and four pairs of 

 quadripundatus . 



Egg Deposition in Apples and Raspberries 



Recent studies have shown that niveus deposits its eggs in the bark 

 of apple, plum and peach trees. Elms, willows and other trees are 



