We agree in essence with Chopard (1938) who stated that it is improper to speak of associations apropos of the ecological distribution of Orthoptera. He continued that it is clearly evident that different species of Orthoptera, which are found grouped on a territory more or less narrowly limited, have no interdependence among them. Their grouping results uniquely from almost similar reactions to the different factors which characterize this limited milieu. There is neither interdependence nor interaction; the grouping is a false biocoenose, born under the action of the environment, and does not survive a modification of this milieu. However, as there are numerous examples of mutual toleration between different species as well as examples of incompatibility, the subject has more than academic interest even if no true ecological significance. On the other hand, further study may show that certain of these associations are definitely ecological, particularly among the feral species. As might be expected, most of the following examples pertain to domiciliary cockroaches. Dozier (1920) occasionally found _Periplaneta americana_ with _Eurycotis floridana_ in decaying stumps, beneath loose bark of decayed trees, and beneath corded wood. Adair (1923) stated that in his house in Egypt _Periplaneta americana_, _Blatta orientalis_, and _Blattella germanica_ were found together in a cupboard. Sambon (1925) found _B. orientalis_ and _B. germanica_ side by side but not fraternizing in a home in Italy. Gould and Deay (1938) observed that apartments over stores were infested with both _B. germanica_ and _P. americana_, but did not indicate whether these occupied the same microhabitat. Gould and Deay (1940) observed that in the Purdue University greenhouse _Periplaneta fuliginosa_ was found "under benches, boxes, pots and other objects in association with the American roach." Dr. L. A. Hetrick (personal communication, 1954) wrote us that several summers before he had had a mixed infestation of cockroaches, which included _Periplaneta australasiae_, _Periplaneta fuliginosa_, and _Pycnoscelus surinamensis_, in his chicken shed.