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A revision of the North American species of Europhilus, a subgenus of Agonum with a note on Agonum belleri (Coleoptera: Carabidae)
Vol 31, Page 1
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Two new species of Plega from Mexico (Neuroptera, Mantispidae)
Vol 31, Page 15
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A taxonomic and distributional study of the species of Prodenia occurring in California (Lepidoptera: Phalaenidae)
Vol 31, Page 21
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Some California species of Hyperaspis new and old (Coleoptera: Coccinellidae)
Vol 31, Page 29
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Additional mosquito records from Utah (Diptera: Culicidae)
Vol 31, Page 31
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A new genus for Cyphon robustus Leconte (Coleoptera: Helbdidae)
Vol 31, Page 34
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The biology of the Mexican chicken bug, Haematosiphon inodorus (Duges) (Hemiptera: Cimicidae)
Vol 31, Page 47
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Notes and descriptions of some species of Crossidius (Coleoptera, Cerambycidae)
Vol 31, Page 63
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Further notes on Iris oratorio in California (Orthoptera: Mantidae)
Vol 31, Page 67
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The morphological and taxonomic significance of the basal abdominal segments in Hemiptera-Heteroptera
Vol 31, Page 73
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The eggs of Corimelaena virilis (McAtee and Malloch) (Hemiptera: Cydnidae: Corimelaeninae)
Vol 31, Page 75
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Records of water beetles from Manchuria and Siberia (Coleoptera: Dytiscidae, Hydrophilidae)
Vol 31, Page 80
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A new Tachina fly of economic importance
Vol 31, Page 83
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A new species of wasp of the genus Solierella from southern California (Hymenoptera: Sphecidae)
Vol 31, Page 85
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New Rhynchophora from western United States (Coleoptera: Curculionidae)
Vol 31, Page 87
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Observations on the biology of Anoplius fulgidus Cresson (Hymenoptera: Pompilidae)
Vol 31, Page 90
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The genus Chaetopsylla Kohaut, 1903 in North America, with the description of a new species (Siphonaptera: Vermipsyllidae)
Vol 31, Page 93
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A new genus for two new species of Dufoureine bees from California (Hymenoptera: Apoidea)
Vol 31, Page 105
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Eriophyid mites- notes and new species
Vol 31, Page 109
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Description of a new species of Phloeosinus and remarks regarding the life history and habits of Renocis heterodoxus Casey (Coleoptera: Scolytidae)
Vol 31, Page 116
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New genera of mayflies from California (Ephemeroptera)
Vol 31, Page 121
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A new species of Schizillus (Coleoptera: Tenebrionidae)
Vol 31, Page 148
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Notes on nomenclature and variation in Platycotis (Homoptera: Membracidae)
Vol 31, Page 151
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New Curculionidae from British Columbia I (Coleptera: Rhyncophora)
Vol 31, Page 155
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The North American Andrenine bees of the subgenus Melandrena with descriptions of new species (Hymenoptera: Andrenidae)
Vol 31, Page 163
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Observations on the nesting habits and flower relationships of some species of Melandrena (Hymenoptera: Andrenidae)
Vol 31, Page 173
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A new species of Lepidosaphes scale infesting Umbrella pine in California (Homoptera: Coccoidea: Diaspididae)
Vol 31, Page 187
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Macrancylus littoralis (Broun) in California, with a note on Phloeophagus protensus (Wollaston) (Coleoptera: Curculionidae)
Vol 31, Page 191
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A new genus and species of blind weevil from Florida (Coleoptera: Cossoninae)
Vol 31, Page 193
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Association of several female sawflies in the genus Pachynematus with previously described males (Hymenoptera: Tenthredinidae)
Vol 31, Page 196
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Description of a new Cryptostemma from North America (Hemiptera: Cryptostemmatidae)
Vol 31, Page 199