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The Monterey pine resin midge-Cecidomyia resinicoloides n. sp
Vol 20, Page 1, Date 1909
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Some new bees of the genus Coelioxys
Vol 20, Page 8, Date 1909
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A revision of the genus Calospasta LeConte
Vol 20, Page 19, Date 1909
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A new Catocala from Arizona
Vol 20, Page 76, Date 1909
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Some corrections in Somatochlora (Odonata - Dragonflies)
Vol 20, Page 77, Date 1909
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The New Jersey records of Hesperotettix brevipennis (Thomas)
Vol 20, Page 104, Date 1909
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Preoccupied genera in Lepidoptera
Vol 20, Page 112, Date 1909
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Migrations of Athena chiron Fabricius
Vol 20, Page 154, Date 1909
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Two fossil bees
Vol 20, Page 159, Date 1909
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Two new species of Coccinellidae (Coleoptera)
Vol 20, Page 161, Date 1909
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Several new western jassids
Vol 20, Page 163, Date 1909
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Coleoptera Collecting by Gas-light.
Vol 20, Page 179, Date 1909
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A new Walking-Stick of the genus Diapheromera from Mexico
Vol 20, Page 212, Date 1909
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Some apparently new Thysanoptera from Michigan
Vol 20, Page 220, Date 1909
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On Thysanoptera
Vol 20, Page 228, Date 1909
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North American Heteroptera
Vol 20, Page 231, Date 1909
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A new thomisid
Vol 20, Page 243, Date 1909
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A new Euceros
Vol 20, Page 245, Date 1909
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Some anthidiine bees
Vol 20, Page 261, Date 1909
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New South American butterflies
Vol 20, Page 263, Date 1909
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American snowball louse, Aphis viburnicola n. sp
Vol 20, Page 280, Date 1909
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Description of the larva and pupa of Tipula trivittata Say
Vol 20, Page 289, Date 1909
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Descriptions of new Hymenoptera
Vol 20, Page 290, Date 1909
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Now species of West Indian Cecidomyiidae
Vol 20, Page 299, Date 1909
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Pemphigus venafuscus n. sp
Vol 20, Page 319, Date 1909
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Doings of Societies. [Stenosphenus notatus]
Vol 20, Page 327, Date 1909
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The Desmodium aphid, Microparsus variabilis n. sp
Vol 20, Page 337, Date 1909
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Geometrid notes
Vol 20, Page 352, Date 1909
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Notes on the American oribatid fauna, with a list of four species of European Oribatidae hitherto unknown in this country
Vol 20, Page 373, Date 1909
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Two new Philippine Culicidae
Vol 20, Page 386, Date 1909
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Dates of Guérin's Iconographie du Regne Animali
Vol 20, Page 396, Date 1909
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Doings of Societies
Vol 20, Page 399, Date 1909
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The first Central American Corduline
Vol 20, Page 409, Date 1909
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The bees of Virginia-Prosopis, Sphecodes, Osmia
Vol 20, Page 412, Date 1909
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New Aleocharinae (Staphylinidae, Col.) of the U. S.
Vol 20, Page 418, Date 1909
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Notes on Chambers' species of Tineina
Vol 20, Page 428, Date 1909-12