Abstract
There are some 270 Arizona species of insects listed in this paper which were collected by the writer and his associates from 1953 to 1959, mostly incidental to economic insect control. However, some of the records were acquired by exploratory collecting. Notes immediately following each species in the list give the host plant(s), host insect(s) or habitat(s), place(s) and date(s) of collection, collector(s) if other than the writer or if in partnership with him, and with some a notation as to degree of infestation and/or other information. The following orders are represented: Coleoptera, Dermaptera, Diptera, Embioptera, Hemiptera, Hymenoptera, Lepidoptera, Psocoptera, and Thysanoptera. Taxonomists who made the identifications are listed and 15 references are cited.

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