. . .Page_71">[Pg 71] oriental origin; and Leurolestes pallidus was endemic in the West Indies (Rehn, 1945). Princis (1954a) rejected Africa as the original home of Blatta orientalis and advanced reasons for placing its origin in Central Asia.

Several domiciliary species have become well established in temperate zones and some even in the Arctic. Bei-Bienko (1950) listed the following 10 species as sinanthropes in the Palearctic zone: Blatta lateralis, B. orientalis, Blattella germanica, Leucophaea maderae, Periplaneta americana, P. australasiae, Polyphaga saussurei, Pycnoscelus surinamensis, and Supella supellectilium. In the warmer parts of the temperate regions, as in their native Tropics, certain domiciliary species breed outdoors as well as indoors. In the less temperate extensions of their ranges most domiciliary species are nearly always found indoors. In regions with low winter temperatures these cockroaches do not survive in unheated structures; but in he. . . Read More