In the first week of July my attention was drawn by my friend, Mr. Joshua Thomson, of Levis, to a strange sight, The plum trees in his grounds were infested with myriads of a new species of Torymus, as many as thirty of the insects appearing on one plum. I never witnessed anything in my entomological pursuits more remarkable. The brilliant little creatures could be seen in the act of depositing their eggs; their ovipositors thrust deep into the fruit. Some of the plums attacked showed signs of a previous attack of the Curculio, but most of them did not. Whether the larvæ of the species feed on the flesh and juices of the plum or attack the grubs of the Curcuiio, I cannot say, for I was unable to follow the life-history of the species.