These papers are essentially as they were presented at a symposium held at the 1970 meeting of the Entomological Society of America. In organizing that symposium, and in editing its results here, I tried to leave as much as feasible of the actual data-gathering and interpreting to the students themselves, not wholly from laziness, but because I believed (and believe) the times are ready for students' views, presented to us by students.
Terry Cronan-HillixLeah K. GensheimerW. A. Cronan-HillixWilliam S. Davidson