In 1950 work was started in New Brunswick to obtain information on the biology, control, and damage caused by the arborvitae leaf miners. At that time all damage was attributed to the arborvitae leaf miner, Argyresthia thiella (Pack.). After the first season's work four species were recognized. Adults submitted to the Systematic Unit, Entomology Division, Ottawa, were identified as Argyresthia thuiella (Pack.), A. freyella Wlshm., Recurvaria thujaella Kft., and a new species of Argyresthia later described by Brower (1) as aureoargentella. With the exception of A. thuiella, insufficient material was available for complete morphological studies, so work was based on finding suitable characters to separate the species in the late larval, pupal, and adult stages.

Genetically-marked virgin queen honey bees were located at various distances up to 14.0 miles from an apiary stocked with genetically-marked drones in an area containing only these experimental bees.

Some matings occurred across distances up to 10.1 miles. With increasing distances from the drone source a decreasing percentage of queens mated successfully. Queens located at the drone source, 3.8 and 6.1 miles distant, began laying at approximately the same time. Those located 8.0 miles distant began laying later and those at 10.1 miles later still.

The most important predators found with broods of Ips pini (Say) and Ips perroti Sw. belong to the orders Coleoptera, Diptera, Hemiptera, and Acarina.

Among the Coleoptera, Enoclerus sphegeus Fab. was the most aggressive and responsible for the greatest predation. The small clerid, Thanasimus undulatus Say, was present in the area but rarely encountered. Dipterous predators included Loachea corticis Taylor, Oscinella sp. nr. magnipalpus Beck. and Medeterus modestus Van Duzee. A hemipterous egg predator, Anthocoris musculus Fall. was found occasionally within the main Ips galleries.

Studies on the biology and control of biting flies in the Canadian north have been described by Hocking et al. (1950), Twinn et al. (1948), and Twinn (1950). The biological investigations have been directed largely toward the economic control of biting flies in isolated military areas. In the subarctic regions of North America so many factors influence the rate of development of mosquitoes that simple relations of time and temperature cannot be used to estimate adequately the periods of infestation. Casual field observations of mosquito larvae and pupae suggested that behaviour patterns peculiar to northern species modify the effect of environmental conditions on the rate of development.

A considerable number of insect species of potential economic importance new to Canada, some being new to North America, have been recorded in the Canadian Insect Pest Survey since new records were reviewed (McNay, 1955). These and others, mainly from 1954 records, are brought together in this paper. Two new mire species are included. Sources of information include Survey reports from officers of the Entomology and Plant Protection divisions, provincial entomologists, and other co-operators; The Canadian Entomologist; The Canadian Insect Pest Review; Proceedings of the Entomological Society of British Columbia; and the Bi-monthly Progress Report of the Forest Biology Division, Canada Department of Agriculture.