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necessary that the eggs be laid in the nest of the wasp ; and I have never 

 found a Rhipipliorus in any of the numerous wasps' nests I have examined, 

 except such as had recently emerged from the cells. I have found the larvas, 

 also, very abundant in some nests, in others very scarce, only tv\o or three 

 sometimes in the whole nest. "Were the eggs laid in the nest, they should 

 always be either abundant or absent. I do not know it from my own obser- 

 vation, but I believe that the perfect beetles hibernate, wherefore the eggs 

 must be laid in spring and summer. I have in vain, however, caught and 

 examined many wasps at large, in the hope of finding them infested by young 

 Rhipiphorus-larvx, as the Andrence, &c, are by those of Meloc. In deter- 

 mining the oviposition, the young larv«e would incidentally be obtained in 

 large numbers. All other methods I have tried to obtain more than the one 

 I accidentally met with have failed. I intend to secure as many perfect Rhl- 

 piphori as I can, and to try to keep them over the winter, in order, if pos- 

 sible, to obtain the eggs. 



