Family MEGACHILIDAE =Melipona nigra= Lepeletier _Commensal._--_Oulopteryx meliponarum_, Brazil (Hebard, 1921): According to Hebard, this cockroach is the first one to be known to inhabit the nests of bees. Nothing is known of the relationship between the cockroach and the bees. [See comment by Sonan (1924) on page 318.] CHECKLIST OF COMMENSAL COCKROACHES WITH THEIR HOSTS The cockroaches are arranged alphabetically by genus and species. The page references are to citations in the classified section above, where details and/or sources of the records are given. =Attaphila aptera= Ant: _Acromyrmex octospinosus_, p. 313. =Attaphila bergi= Ants: _Acromyrmex lobicornis_, p. 312. _Acromyrmex lundi_, p. 312. _Acromyrmex silvestrii_, p. 313. =Attaphila flava= Host unknown, presumably an ant, p. 314. =Attaphila fungicola= Ants: _Acromyrmex octospinosus_, p. 313. _Atta cephalotes_, p. 313. _Atta texana_, p. 313. =Attaphila schuppi= Ant: _Acromyrmex niger_, p. 312. =Attaphila sexdentis= Ant: _Atta sexdens_, p. 313. =Attaphila= sp. Ant: _Atta cephalotes_, p. 313. =Atticola mortoni= Ant: _Camponotus rufipes_, p. 312. =Ergaula capensis= Termites, p. 311. =Myrmeblattina longipes= Ant: _Odontomachus affinis_, p. 314. =Myrmecoblatta rehni= Ants: _Camponotus maculatus_(?), p. 312. _Formica rufibarbis_, p. 312. _Formica subcyanea_, p. 312. =Myrmecoblatta wheeleri= Ant: _Solenopsis geminata_, p. 314. =Nocticola sinensis= Termites: _Macrotermes barneyi_, p. 311. _Odontotermes_ sp., p. 311. =Nocticola termitophila= Termites: _Macrotermes malaccensis_, p. 311. _Odontotermes_ sp., p. 311. _Termes_ sp., p. 311. =Nothoblatta wasmanni= Ant: _Camponotus rufipes_, p. 312. =Oulopteryx meliponarum= Bee: _Melipona nigra_, p. 314. =Phorticolea boliviae= Ants: _Camponotus femoratus_, p. 311. _Crematogaster limata parabiotica_, p. 312. =Phorticolea testacea= Ant: _Camponotus rufipes_, p. 312. =Sphecophila polybiarum= Wasp: _Polybia pygmaea_, p. 314. =Sphecophila ravana= Termite: _Coptotermes ceylonicus_, p. 310. =Sphecophila termitium= Termite: _Macrotermes bellicosus_ or _Macrotermes natalensis_, p. 311. OBSCURE ASSOCIATIONS Cockroaches that are sometimes found in the nests of, or in association with, other animals are not necessarily commensals. This is particularly true of cockroaches that normally are found unassociated with other animals or that merely occupy the same habitat with the other animals because of similar microclimatic requirements (see Chopard, 1924c).