In Manitoba Melanoplus mexicanus mexicanus (Sauss.) is usually most abundant in areas of light soil. In such areas the bulk of the eggs are, as a rule, widely distributed in either cropped or recently reverted fields. Concentrations of eggs, when they occur, have commonly been confined to ridges of drift soil. During the fall of 1938, however, some of the heaviest concentrations of this species ever recorded for the province were discovered, not in these locations, but in woodland pastures of heavier soils in and near that portion of Lang's Valley occupied by the Pembina River. The oviposition sites, in fact, were so atypical that they resembled egg beds of Camnula pellucida Scud. rather than deposits of mexicanus eggs.