Abstract
This research is part of a continuing, broad-scale field study of both male and female behavior in solitary, ground-nesting wasps. Emphasis at the present time is on the genus Philanthus (Hymenoptera, Sphecidae). Earlier work in Jackson Hole (Evans, 1970, 1973) had revealed the presence of large nesting aggregations of three species of this genus. Since that time we have come to appreciate that male mating strategies are deserving of detailed, comparative study; we are also aware of details of nest structure that need to be clarified. The ultimate goal of these studies is the preparation of a monograph on the comparative behavior of the species of Philanthus.