In 1937-38 the Argentine Department of Agriculture initiated an exchange of grasshopper parasite material with the Canadian Department of Agriculture which was engaged in a study of the natural control of grasshoppers in various provinces of Canada. By 1942 it was considered desirable to introduce exotic species of parasites into Canada on as wide a scale as possible, and the temperate regions of South America were selected as being the most promising for a survey. The parts of the temperate zone of South America to which preferential attention was to be given included the countries of Uruguay, Argentina, and Chile. The well known grasslands of the Rio de la Plata area have been partially transformed into one of the world centres for cereal production and as in other parts of the world increased grasshopper populations constitute a major problem in the agriculture of the region. Here species of the genus Dichroplus are frequently pests in the way in which members of the closely related Melanoplus are in North America.

The Presidential Address given by C. P. Clausen to the 62nd Annual Meeting of the Association of Economic Entomologists and recently published in the Journal of Economic Entomology (1) contains much food for thought for workers in the field of biological control. The thesis developed by Clausen in his address is, briefly, that any introduced parasite or predator that is destined to produce full commercial corkrol wiIl do so within three generations or at most within three years. If it does not produce full commercial control within this period it is safe to say that it will never do so. Species that prove ineffective after three generations or three years from the period of introduction should therefore be dropped and efforts directed toward the introduction of other species.

During the course of an investigation of the dispersal of the spruce budwonm (Henson, 1950), mass flights of the insect have been studied. The records of these flights are to be found in the files of the Forest Insect Laboratory, Sault Ste. Marie, Ontario, but in many cases these records are not complete. Nineteen flights for which sufficient data exist have been examined.

A comprehensive study of insects affecting the low-bush blueberry in New Rrunswick was begun in 1946 largely because of the destructive outbreak of Actebia fennica (Tausch.) in 1944 and 1945. The work was carried on in Charlotte County, where most of the commercial blueberry areas of the Province are located. This paper deals only with the lepidopterous larvae, among which are found the most important pests, such as climbing cutworms, loopers, and leaf tiers.