A Review of Studies of Blood-Sucking Flies in Northern Canada

Interest in the Canadian north has increased greatly during recent years because of its importance in national defence, and the actual and potential value of its natural resources. A serious hindrance to northern development is the presence during the short summer season of great numbers of blood-sucking flies that make liie difficult for man and beast. The major pem in the forested subarctic are mosquitoes, black flies, and tabanids (the so-called deer flies and moose flies); beyond the tree-line on the arctic tundra black flies are much less troublesome and tabanids do not occur, but in many regions mosquitoes are a terrible scourge.