Notes on the Natural Control ofColeophora laricella, the Larch Case-bearer

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Abstract
This paper consists of a preliminary report on investigations of the parasites ofColeophora laricellain Europe, with a view to their possible utilisation in Canada.Systematic and biological notes on the more important species are given.The most promising parasite,Angitia nana, has already been shipped to Canada. It is a solitary internal parasite of the case-bearer larva. Further investigations are necessary before it can be considered safe to introduce any other species.I am very grateful to Dr. C. Ferrière, of the Imperial Institute of Entomology, for the time and trouble he has given to the work of identifying the parasite material. The late Mr. J. C. Robbins helped materially by kindly carrying on observations while I was absent through illness, and by collecting material in the field. Mr. R. J. Spittle has been of great assistance in the production of the finished drawings, several of them being mainly his own work. A number of the earlier field collections were made by Mr. H. S. Hanson.

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