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Notes on the biology of Gynacantha nervosa Rambur (Aeschninae), a crepuscular dragonfly in Guatemala
Vol 13, Page 1
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A study of the North American Odynerus hidalgo de Saussure (= ductus Cresson) (Hymenoptera, Vespidae)
Vol 13, Page 9
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A few new Hemiptera
Vol 13, Page 25
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Some new Deltocephaloid leafhoppers (Homoptera Cicadellidae) from Illinois
Vol 13, Page 32
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Asilidae, new and otherwise, from the South-West, with a key to tho genus Stictopogon. [Contd.]
Vol 13, Page 37
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A preliminary study of the genus Slylops in California (part 2) (Strepsiptera, Stylopidae)
Vol 13, Page 49
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The life history of Gaurax arene Coq. (Dipt.-Chloropidae), an egg predator of the black widow spider, Latrodectus mactans (Fabr.)
Vol 13, Page 58
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New horseflies. (Tabanidae, Diptera) from the south-western United States
Vol 13, Page 64
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New species of Andrena from California (Hymenoptera)
Vol 13, Page 69
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Some new genera and species of North American parasitic bees (Hym-enoptera)
Vol 13, Page 75
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Two new mayflies from the Pacific coast
Vol 13, Page 85
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The Jones collection of Thysanoptera
Vol 13, Page 89
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A representative of an old World subfamily of Acrididae in South-Western North America
Vol 13, Page 97
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Studies in the genus Hister (Coleoptera, Histeridae)
Vol 13, Page 106
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Notes on the migrational flights of Vanessa cardui in Utah
Vol 13, Page 109
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Three new beetles of the genus Cryptocephalus (Chrysomelidae)
Vol 13, Page 111
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Four new California Coleoptora (Buprestidae, Scarabaeidae and Cicindelidae)
Vol 13, Page 115
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The genus Dactuliothripa Moulton
Vol 13, Page 121
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The Aphid genus Flabellomicrosiphum in Utah
Vol 13, Page 127
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A note on Gyrinid beetles from Escuintla, Guatemala
Vol 13, Page 129
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Collembola found under the bark of dead trees in California, with descriptions of two new species
Vol 13, Page 131
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Biological notes on Timema californica Scudder (Phasmoidea: Timemidae)
Vol 13, Page 137
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Dr. Adalbert Fenyes
Vol 13, Page 145
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Bees from San Miguel Island, California
Vol 13, Page 148
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The effect of stylopization on Andrena porterae Coc-kerell (Hymenoptera)
Vol 13, Page 157
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Synopsis of the Grylloblattidae with the description of a new species from Oregon (Orthoptera)
Vol 13, Page 159
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An annotated list of the insects, mostly Coleoptera, associated with Jeffrey Pine in Lassen National Forest, California
Vol 13, Page 172
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Generic characteristics of Aonidiella Berlese and Leonardi, and a description of a new species from Australia (Homoptera-Diaspididae)
Vol 13, Page 176
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Studies among the Cocoinellidae, no. 8 (Coleoptera)
Vol 13, Page 182
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Concerning the Plebejus icarioides Rassenkreis (Lepi LXXIV deptera: Lycaenidae)
Vol 13, Page 184
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A new species of Valgus and a new generic record for Mexico (Coleoptera-Scarabaeidae)
Vol 13, Page 190