Seín (_in_ Rehn and Hebard, 1927) in Puerto Rico found _Aglaopteryx facies_ in abandoned cocoons of _Megalopyge krugii_ (Dewitz) and in leaves webbed together by caterpillars and in abandoned spiders nests. Wolcott (1950; and _in_ Rehn and Hebard, 1927) also found _A. facies_ in the empty cocoons of _M. krugii_ and in the larval tents of _Tetralopha scabridella_ Ragonot on _Inga vera_ (coffee shade tree); and "Where there are no butterfly-nests, it lives in abandoned spider-nests on the leaves of other forest trees." Cotton (_in_ Wolcott, 1950) found the type of _Aglaopteryx absimilis_ also living in the abandoned cocoon of _M. krugii_ on bucare trees in Puerto Rico. Wolcott (1950) reported that _Plectoptera dorsalis_, _Plectoptera infulata_, and _Plectoptera rhabdota_ have been found living in trees between leaves or in "butterfly-nests" of _Tetralopha scabridella_ in leaves of _Inga vera_, or nests of _Pilocrocis secernalis_ (Möschler) in the leaves of _Petitia domingensis_ in the mountains of Puerto Rico. Seín (_in_ Rehn and Hebard, 1927) had collected _P. rhabdota_ in the nest of larvae of _T. scabridella_. Wolcott (1950) reported that _Nyctibora lutzi_ had been found in a large rotten stump associating with "'comején' termites [_Nasutitermes costalis_ (Holmgren)], yellow wood-ants and rhinoceros beetle grubs." Rehn and Hebard (1927) found _Simblerastes jamaicanus_ in numbers in the debris of an abandoned termites' nest in Jamaica: "To what extent the species is dependent upon the protection of the termite or other structures remains to be determined." In Virginia _Cryptocercus punctulatus_ has been found living in the same galleries with _Reticulitermes_ sp., and on the Pacific Coast it has been found occupying the same log with _Termopsis_ sp. (Cleveland et al., 1934). Shelford (1909) found one male and one female of _Balta platysoma_ in a nest of a spider of the genus _Phryganoporus_ and assumed a symbiotic association. Chopard (1924) recorded _Mareta acutiventris_ from empty nests of spiders on Barkuda Island, India; nothing is known of the relationships, if any, between these cockroaches and spiders. Chopard (1924c) found _Margattea_ sp. in the nest of the ant _Acropyga acutiventris_ Roger; he also found _Margattea_ sp., _Periplaneta_ sp., _Polyphaga indica_, and _Temnopteryx obliquetruncata_ in deserted termite mounds in India. However, he believed that none of these species were more than accidental associates of the host insects; he considered them hygrophilous cockroaches which had found a retreat in the nests.