Each year since 1911 the pale western cutworm, Agrotis orthogonia Morr., has taken a toll of the grain crops in some part of the Canadian prairies. The extent of the outbreak has varied from small, isolated areas of infestation to gcneral outbreaks covering over 150,000 square miles. Until 1936 the only practical method of controlling this cutworm was the use of definite cultural practices designed to prevent the moths from ovipositing in certain fields during August and early September.

During a recent visit to the Museum of Comparative Zoology at Cambridge, Mass., undertaken primarily for the purpose of studying Chambers' Coleophorid types, I naturally took advantage of the opportunity to examine the numerous types of Geometridae incorporated from the Packard, Swett and Cassino collections. In consequence I was enabled to clear up a number of points which had been worrying me for some time and in the following notes I offer the main results of such studies.

The economic entomologist is concerned with the eradication or control of insect infestations, or with the restriction of spread of pest-species. In the course of such work, he is often confronted with the appearance of new infestations in cleared or virgin areas. These infiltrations from other source regions originate, in part, from the gradual extensions of other foci by flights or migratory movements, and, also from the intervention of air currents.

During the summers of 1941 and 1942, with the help of students, I collected in the vicinity of Duluth, Minnesota, some individuals of a species of ant recently described by Dr. M. R. Smith (1939), from Quebec, Canada. The original account of Harpagoxenus canadensis was based on the queen caste, an intermediate ergatoid female type, and a simple ergatoid female type, representing 12 specimens in all.