We thank the following individuals for supplying us with living specimens of the species indicated: T. Campbell, Commonwealth Scientific and Industrial Research Organization, Canberra, New South Wales (_Panesthia australis_); Dr. L. R. Cleveland, Harvard University (_Cryptocercus punctulatus_); Dr. N. T. Davis, University of Connecticut (_Byrsotria fumigata_); Dr. F. Englemann, Albert Einstein Medical School (_Gromphadorhina portentosa_); Dr. F. A. Lawson, Kansas State College (_Comperia merceti_); Dr. K. D. Roeder, Tufts University (_Hierodula tenuidentata_ (?)); Dr. E. O. Wilson, Harvard University (_Ischnoptera deropeltiformis_). We thank the following individuals for checking the taxonomy of the following organisms or for reading the indicated sections of the manuscript: _Fungi._--Dr. R. K. Benjamin, University of California; Dr. E. G. Simmons, Quartermaster Research Laboratories. _Protozoa._--Dr. R. R. Kudo, Professor Emeritus, University of Illinois. _Helminths._--Mrs. May Belle Chitwood and Dr. J. T. Lucker, U. S. Department of Agriculture. _Centipedes and whipscorpions._--Dr. R. E. Crabill, Jr., U. S. National Museum. _Scorpions._--Dr. J. L. Cloudsley-Thompson, University of London; Dr. R. E. Crabill, Jr. _Spiders._--Dr. B. J. Kaston, University of Connecticut; Dr. R. E. Crabill, Jr. _Mites._--Dr. J. H. Camin, Chicago Academy of Sciences; Dr. E. W. Baker, U. S. National Museum. _Cockroaches._--Dr. A. B. Gurney and J. A. G. Rehn. _Ants._--Dr. W. L. Brown, Jr., Museum of Comparative Zoology, Harvard College. _Hymenopterous parasites of cockroach eggs._--Dr. B. D. Burks, U. S. National Museum; Dr. H. K. Townes, University of Michigan. _Cockroach-hunting wasps._--Dr. K. V. Krombein, U. S. National Museum. _Lepidoptera._--Dr. J. F. G. Clarke, U. S. National Museum; Dr. E. L. Todd, U. S. Department of Agriculture. _Miscellaneous insects._--Dr. R. S. Beal, Dr. A. B. Gurney, C. W. Sabrosky, Dr. R. I. Sailer, and J. T. Spilman, U. S. National Museum. _Fishes._--Dr. L. P. Schultz, U. S. National Museum. _Amphibians and reptiles._--Dr. Doris M. Cochran, U. S. National Museum. _Birds._--Dr. Herbert Friedmann, U. S. National Museum. _Mammals._--Dr. D. H. Johnson, U. S. National Museum. We thank the following individuals for reading the entire manuscript: J. A. G. Rehn; Dr. A. B. Gurney; Maj. Gordon Field, U. S. Army; and Dr. H. L. Sweetman, University of Massachusetts. The monograph has profited by the friendly criticism of these entomologists.