know. When beneficial insects, parasitic or predaceons, have 

 been successfully imported, no methods by which they may be 

 successfully established should be neglected. Predaceous in- 

 sects are generally comparatively large and hardy, and can be 

 safely liberated where their food is abundant. Parasites on the 

 other hand are often excessively minute and delicate and may 

 require the most careful handling. As a rule should some spe- 

 cies that it is desiral)le to establish ])e received in an\- num- 



bers, it is always safer to divide them, and adopt various meth- 

 ods. It may be safely said that in nearly all cases (unless climatic 

 conditions are altogether unfavorable) half the specimens re- 

 ceived should be at once liberated in a suitable locality. Some 

 minute Chalcids and other parasites are verv easily In'ed in 

 captivity, but this is by no means always the case. In rearing 

 insects in ca])tivit}- in tropical countries, there is one al)Solute 

 essential, which is perfect isolation from ants and other carni- 

 vorous creatures. Several years ago, I had built for this pur- 

 pose a small house isolated from the ground, the supports rest- 



