Excerpt: The comprehensive survey of literature on the biology of the Scarabaeidae by Ritcher (1958) indicates that the ecology of many large groups is known from a study of very few species. Such is the case with the rhinoceros beetles in the subfamily Dynastinae. From 1960 to 1965 I had many opportunities to observe the rhinoceros beetle Xyloryctes jamaicensis (Drury) in a woodlot near Wheatley, Ontario, on the north shore of Lake Erie. My notes, although fragmentary, suggest areas of further research