The first paper of this series is in the January number of this Journal (pp. 9–14); the second is in the April issue of the Journal of the New York Entomological Society. The present instalment deals chiefly with species found in the Western Provinces of British America and a few others that are likely to occur there. The determination of a new species of Rancora from Calgary and Manitoba makes some general remarks on that genus timely. There is a number of excellent collectors now hard at work on th Noctuid fauna of that general region an extending westward to Vancouver, whose work deserves the greatest praise and to whose efforts is due the development of a totally new faunal region for this family of moths.