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The California mayflies of the genus Rhithrogena (Ephemeroptera)
Vol 33, Page 1, Date 1957
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Two new species of the genus Recurvaria Haw. (Lepidoptera: Gelechiidae)
Vol 33, Page 9, Date 1957
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An improved method for collecting Brachy-cistidine females (Hymenoptera: Tiphiidae)
Vol 33, Page 13, Date 1957
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New species and records of Xeromegachile and Derotropis (Hymenoptera: Megachilidae)
Vol 33, Page 19, Date 1957
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A new species of Callidium from juniper (Coleoptera: Cerambycidae)
Vol 33, Page 33, Date 1957
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A note on the nesting habits of Pompilus (Ammosphex) occidentalis (Dreisbach) (Hymenoptera: Pompilidae)
Vol 33, Page 39, Date 1957
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Notes on the breeding seasons of some Illinois Carabid beetles (Coleoptera)
Vol 33, Page 53, Date 1957
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A Limnocoris for the United States (Hemiptera: Naucoridae)
Vol 33, Page 71, Date 1957
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Arrenuri from the island of Yap. (Acarina: Arrenuridae)
Vol 33, Page 75, Date 1957
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A new genus and species of Tetranychidae (Acarina)
Vol 33, Page 87, Date 1957
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Fluorescent differentiation of the internal organs and tissues of insects
Vol 33, Page 91, Date 1957
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Remarks about Cicindelids, with descriptions of two new subspecies (Coleoptera)
Vol 33, Page 99, Date 1957
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Distributional records for some species of Pleocoma (Coleoptera, Scarabaeidae)
Vol 33, Page 102, Date 1957
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A new entedontine Chalcid-fly from seed capsules of eucalyptus in California (Hymenoptera: Eulophidae)
Vol 33, Page 109, Date 1957
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A revision of the bee genus Crocisa in the Philippines (Hymenoptera, Apidae)
Vol 33, Page 111, Date 1957
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The species of Cricotopus midges living in the blue-green alga Nostoc in California (Diptera: Tendipedidae)
Vol 33, Page 121, Date 1957
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New Curculionidae (Coleoptera) from British Columbia. II
Vol 33, Page 127, Date 1957
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Additions to the distribution of North American Nemestrinidae; with notes on venational variation (Diptera)
Vol 33, Page 133, Date 1957
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Notes and descriptions of new California Bombyliidae (Diptera)
Vol 33, Page 141, Date 1957
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A new genus of Euplectini from California (Coleoptera: Pselaphidae)
Vol 33, Page 149, Date 1957
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Biological notes on a new Chalcid-fly from seed-like eucalyptus galls in California
Vol 33, Page 153, Date 1957
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A synopsis of the California deathwatch beetles of the genus Emobius Thomson, with descriptions of two new species which attack pine cones (Coleoptera: Anobiidae)
Vol 33, Page 157, Date 1957
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Two mites of the genus Cheylostigmaeus, including a new species from Point Barrow, Alaska. (Acarina: Stigmaeidae)
Vol 33, Page 163, Date 1957
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A key to the North American members of the genus Anthocoris Fallen (Hemiptera: Anthocoridae)
Vol 33, Page 171, Date 1957
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Three new species of Thyanta Stal (Heteroptera: Pentatomidae)
Vol 33, Page 175, Date 1957
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Three new California spider wasps (Hymenoptera, Pompilidae)
Vol 33, Page 181, Date 1957
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New species and subspecies of Tenebrionidae (Coleoptera)
Vol 33, Page 187, Date 1957
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New Bombyliid flies from Chiapas, Mexico (Diptera)
Vol 33, Page 200, Date 1957
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A new species of Typhlodromus from California (Phyto-seiidae: Acarina)
Vol 33, Page 203, Date 1957