Abstract
Symbiotic micro-organisms have been found in practically all orders of insects with the exception, perhaps, of the Thysanoptera. The literature to 1930 has been admirably summarized by Buchner (1930). Symbiosis in Pseudococcus citri (Risso) has been studied in great detail by previous workers and Buchner's summary served as the basis for this study which was undertaken when it seemed possible that the symbionts of Pseudococcus brevipes (Ckl.) were in some way connected with the insect's oral secretions (Carter, 1933). The writer's studies were greatly facilitated as a result of a short stay in Dr. Buchner's laboratory in Breslau where the cordial co-operation of Dr. Buchner and Dr. Anton Koch made the examination of a large amount of comparative material possible.
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