Code 1959 Lemmus trimucronatus May 5-15 Upper Colville between Etisjuk and Colam nagovish. Throughout this area in the rolling hills adjacent to the river valley, wherever we looked there was abundant lem- ming and mole vole. In local areas of a few hundred square yards the cutting of turnocks was quite as extensive as that observed earlier along the Pitmegele River. The presence of short-eared owls, occasional marsh harriers, and long-tailed and parasitic jaegers correlate with the ground indications of substantial, but not weak "high" numbers of rodents. Judging by the kills found in boar-legged hawks, peregrine falcon, and peregrine mists - that two species chiefly involved are L. trimucronatus and M. olerosopus. It may be significant that fresh killed lemmings have been found at the awls of both species of falcon. The peregrine, in particular, would not be likely to pick up lay- newp, unless they were especially common and conspicuous. Sign in the flood plain was not so noticeable.