In spite of the many discussions on this subject, both in literature and meetings of entomological societies, a considerable controversy exists between those entomologists who, for determination, readily resort to a comparison of the hypopygia, this being too often the only part of the insect offering satisfactory species characters, and those who consider this practice beneath the dignity of scientific entomology. As it happened that the writer in the course of several years had to do much work on Fungivoridae, he had ample opportunity to become familiar with this problem.