In drug stores Frings (1948) found cockroaches behind the mirror and between the sink and the cooler. Thousands were found in hollow ornamental shelf edging. The hollow bases of malted-milk dispensers and drink mixers were cockroach havens. In a hospital Frings (1948) found cockroaches in decorative trim around doorways, by the thousands in wicker laundry baskets, and in incubators for premature babies. In military hospitals we have seen cockroaches (_Blattella germanica_) in kitchens and dining halls in the usual hiding places mentioned above and on the undersides of stainless-steel serving tables. In department stores cockroaches have been found in food departments, beauty salons, rest rooms, dressing rooms, linen departments, and stationery departments (Anonymous, 1952). The infestation in the linen department was traced to clean towels which, when returned from the laundry, contained at least 500 cockroaches per bundle. The insects were carried into the rest rooms and beauty salon when the towels were distributed. The microhabitats of cockroaches in privies and sewers have not been studied. These habitats are particularly important in view of the demonstrated migrations of cockroaches from sewers into dwellings and the possible dissemination of pathogenic microorganisms from feces to food. The reader is referred to our 1957(a) paper for a summary of the known information on cockroach dispersal from sewers. COCKROACHES ASSOCIATED WITH LAND-BASED STRUCTURES Most of the cockroaches listed below are either known domiciliary species or they have been found one or more times in houses or other man-made structures. The known structural pests breed within the building. Certain other species, which have been observed only infrequently in structures and are not known to breed there, may possibly be incipient pests; these latter species may attain future economic importance if they establish breeding colonies within a structure. A few species have undoubtedly wandered indoors by accident. It is difficult to decide whether a particular species was an accidental invader or whether it was attracted indoors in response to some stimulus. Only additional information will provide the desired answers. =Aglaopteryx ypsilon= _Trinidad._--Male found indoors (Princis and Kevan, 1955). =Allacta similis= _Hawaii._--Found only indoors at Nauhi. Otherwise this is apparently an outdoor species (Swezey and Williams, 1932). =Blaberus craniifer= _Cuba._--Household pest (Deschapelles, 1939). Particularly abundant in houses in Santiago and Havana (Rehn and Hebard, 1927). _Florida._--Under boards in woodshed (Rehn and Hebard, 1912, 1914). =Blaberus discoidalis= _Ecuador._--In eating places (Campos R., 1926). _Hispaniola._--In houses (Rehn and Hebard, 1927). _New Jersey._--In greenhouse (Weiss, 1917). _Puerto Rico._--In homes (Seín, 1923). In fruit stores (Wolcott, 1950). =Blatta lateralis=