Since the writer's report on “The Subarctic Odonata of North America” was published, several collections have been received from localities included within the territory covered in that paper, which add materially to our knowledge of the dragonfly fauna of the Hudsonian Zone on this Continent. Most of these collections are from the Northwest Territories but a few are from northern Alberta and Newfoundland.

I had recently the pleasure of receiving from Mr. J. I. Beaulne of Quebec City an interesting dipterous insect for identification. The locality label attached to the specimen read “Lachine, Que., 4, IX, 43, J. I. Beaulne.” The insect belonged to the genus Acrocera of the family Acroceridae and did not match any of the specimens in the collection of the University of Montreal. I sent it to Mr. G. E. Shewell of the Department of Agriculture, Ottawa, for identification. Mr. Shewell kindly replied, stating that the fly was Acrocern steyskali Sabr., a new record for Quebec. He further stated that the species was described quite recently from northeastern United States material and that he did not think it had been recorded from anywhere in Canada.

The preceding part under this title was published in 1947 (Can. Ent., 78: 155-159). At this time I am describing four species of the genus Tipula from Arizona and California, the types being preserved in my collection except where indicated to the contrary in the text.

In the establishment of insect parasites, the production of large numbers for release in heavily infested areas is often desirable. This was especially true in the case of parasites of the European spruce sawfly, Gilpinia hercyniae Htg. The rapid increase in numbers nad extent of the sawfly infestation in Canada with the resulting losses in timber as reported by Balch (1940) and Baird (1940) created a situation of grave concern, and the need for rapid colonization of insect parasites as part of the general control programme was considered urgent. Of the parasites chosen for introduction, the tachinid Sturmia sp. was considered very promising. Following initial establishment of this species, it was decided that an attempt should be made to propagate it in numbers sufficient for widespread distribution either by improving the methods in use at that time or by devising radically different methods.