_U.S.A._--Apparently found in greatest abundance in the extreme desert conditions of the southwestern United States (Hebard, 1917). Two small groups of males were observed in the midst of the sandy desert north of Yuma, Ariz.; these insects alternately flew and ran over the sand in the hot sun while headed in a southwesterly direction (Wheeler, 1911). =Euandroblatta palpalis= _Northern Kenya._--In desert-grass and thorn-bush country (Kevan and Chopard, 1954). =Heterogamodes rugosa= _Northern Kenya._--"All from desert grass and thorn bush (on sand)." It was stated (under discussion of _Tivia fulva_) that _Heterogamodes_ females live more or less buried in the sand (Kevan and Chopard, 1954). =Namablatta bitaeniata= _Southwestern Africa._--Limited in distribution to the more arid portions, being peculiar to extreme desert conditions (Rehn, 1937). =Nauphoeta punctipennis= _Northern Kenya._--In desert grass and thorn bush; "probably the commonest of all the medium-sized cockroaches occurring in the area under discussion, coming very freely to light" (Kevan and Chopard, 1954). =Parcoblatta desertae= _U.S.A._--In the desert and semidesert mountainous areas of the Southwest; it is rarely found on the desert floor (Hebard, 1917). Found under boulder on bare desert (Rehn and Hebard, 1909). =Polyphaga aegyptiaca= _Caucasus._--The wingless female was found buried in sand and dust (Burr, 1913). _Turkmen S.S.R._--Although this species is secondarily encountered in dwellings and courtyards, it is a very characteristic insect of the Trans-Caspian deserts; the females are encountered fairly frequently as inhabitants of sand, where they run slowly over the surface, or dig themselves into the sand to continue their forward motion not far below the surface (Fausek, 1906). Uvarov (_in_ Chopard, 1929b) indicated that females of this genus are found in various desert localities, particularly where vegetative debris occurs, but they are not strictly attached to sandy terrain. =Polyphaga indica= _Turkmen S.S.R._--This species prefers sandy soils where the nymphs, alate males, and wingless females "swim" readily through the sand; they can also be found in the burrows of desert animals (Vlasov and Miram, 1937). =Polyphaga saussurei= _Turkmen S.S.R._--Its principal habitats are rodent burrows in loess dust and burrows of the desert turtle (Vlasov and Miram, 1937). =Supella hottentotta= _Northern Kenya._--Taken in bushes by dry river bed and in desert-grass and thorn-bush country at several stations (Kevan and Chopard, 1954). "...taken with light at night running on bark of a large acacia tree" (Rehn, 1947). =Symploce kevani= _Northern Kenya._--In desert grass and thorn-bush country (Kevan and Chopard, 1954). =Theganopteryx straminea= _Northern Kenya._--Taken at three stations in desert grass and thorn bush (Kevan and Chopard, 1954). =Tivia brunnea=