XII. Arthropoda associated with cockroaches 210 Arachnida 211 Chilopoda 222 Insecta 224 Hymenoptera 234 Predators and parasites of cockroach eggs 234 Host selection by egg parasites 254 Cockroach-hunting wasps 255 Ants predaceous on cockroaches 266 XIII. Vertebrata associated with cockroaches 268 Pisces 268 Amphibia 269 Reptilia 272 Aves 276 Mammalia 283 XIV. Checklist of cockroaches and symbiotic associates 290 XV. Cockroaches as commensals 310 Hosts of commensal cockroaches 310 Checklist of commensal cockroaches with their hosts 315 Obscure associations 316 XVI. Cockroaches as predators 319 Interspecies predation 319 Intraspecies predation 322 XVII. Associations among cockroaches 324 Familial associations 325 Gregariousness 330 Intraspecies fighting 336 Interspecies compatibility 337 Interspecies antagonism 341 XVIII. Defense of cockroaches against predators 343 XIX. The biological control of cockroaches 348 Invertebrates 349 Vertebrates 353 Acknowledgments 354 References 356 Index 441 THE BIOTIC ASSOCIATIONS OF COCKROACHES[1] BY LOUIS M. ROTH AND EDWIN R. WILLIS[2] _Pioneering Research Division, United States Army Quartermaster Research and Engineering Center Natick, Mass._ (With 37 Plates)