SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 141 [Illustration: Smithsonian Institution Logo] "EVERY MAN IS A VALUABLE MEMBER OF SOCIETY WHO, BY HIS OBSERVATIONS, RESEARCHES, AND EXPERIMENTS, PROCURES KNOWLEDGE FOR MEN"--JAMES SMITHSON (PUBLICATION 4470) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION 1961 PORT CITY PRESS, INC. BALTIMORE, MD., U. S. A. ADVERTISEMENT The Smithsonian Miscellaneous Collections series contains, since the suspension in 1916 of the Smithsonian Contributions to Knowledge, all the publications issued directly by the Institution except the Annual Report and occasional publications of a special nature. As the name of the series implies, its scope is not limited, and the volumes thus far issued relate to nearly every branch of science. Papers in the fields of biology, geology, anthropology, and astrophysics have predominated. LEONARD CARMICHAEL, _Secretary, Smithsonian Institution_. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 141 (WHOLE VOLUME) THE BIOTIC ASSOCIATIONS OF COCKROACHES (WITH 37 PLATES) BY LOUIS M. ROTH AND EDWIN R. WILLIS Pioneering Research Division, United States Army Quartermaster Research and Engineering Center Natick, Mass. [Illustration: Smithsonian Institution Logo] (PUBLICATION 4422) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION DECEMBER 2, 1960 [Illustration: Plate 1 _Blaberus craniifer_, c. × 2. 1. (Photograph by Jack Salmon, Philadelphia Quartermaster Depot.)] SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 141 (WHOLE VOLUME) THE BIOTIC ASSOCIATIONS OF COCKROACHES (WITH 37 PLATES) BY LOUIS M. ROTH AND EDWIN R. WILLIS Pioneering Research Division, United States Army Quartermaster Research and Engineering Center Natick, Mass. [Illustration: Smithsonian Institution Logo] (PUBLICATION 4422)