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1926

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Hymenoptera, Philip H. Timberlake; Bernice P. Bishop Museum Bulletin

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Шмепи (Bombidae.)., A. П. Белизин

1925

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Eine neue deutsche Andrena-Art aus der A. parvula W. K.-Gruppe, J. D. Alfken; Sonder-Abdruck aus den Mitteilungen der Badischen Entomologischen Vereinigung Freiburg

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Prosopis meridionalis Forst. (Hym. Apid.), J. D. Alfken; Deutsch. Ent. Zeitschr.

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Ueber das Mannchen von Liris haemorrhoidalis F. (Hymen.), J. D. Alfken; Sonderabdruck

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Zwei neue indische Prosopis-Arten und uber die 3 grossen indischen Xylocopa-Species (Apid.), J. D. Alfken; Entomologische Mitteilungen

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Neues zum Hummelproblem, Paul Peter Babiy; Zeitschrift f. wissensch Zoologie

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Eumenes Dyscherus H. De Saussure, a Neotropical, not an African Wasp, and other notes on Synonymy (Hymenoptera), Joseph Bequaert; Bulletin of the Brooklyn Entomological Society

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The Genus Ancistrocerus (Hymenoptera, Vespidae) in North America, with a partial key to the species, Joseph Bequaert; Transactions of the American Entomological Society

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Description of a New Psithyrus, with an Account of Psithyrus Laboriosus, and Notes on Bumblebees, Joseph Bequaert and Otto E. Plath; Bulletin of the Museum of Comparative Zoology

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Beiträge zur Kenntnis der Bienengattung Halictus Latr. II., Paul Blüthgen; Archiv für Naturgeschichte

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Beiträge zur Kenntnis der Hymenopterenfauna des Saaletals, Paul Blüthgen; Stettiner Entomologische Zeitung

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Onze Behangersbijen (Megachile), B. E. Bouwman; De Levende Natuur

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Some Species of the Genus Leucospis, Charles Thomas Brues; Psyche

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La Voie Bucco-Pharyngée Chez la Scolie, L'abeille Maçonne et la Xylocope Violette, E. Bugnion; Bull. Soc. Zool. Paris

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Bees of the Genus Cœlioxys in the Collection of the California Academy of Sciences, T. D. A. Cockerell; The Pan-Pacific Entomologist

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Descriptions and Records of Bees — CIV, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — CV, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — CVI, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — CVII, T. D. A. Cockerell; Annals and Magazine of Natural History

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Diploplectron in California (Hymen. : Sphegoidea), T. D. A. Cockerell; Entomological News

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Some Bees Collected by Mr. P. H. Timberlake at Riverside, California, T. D. A. Cockerell; The Pan-Pacific Entomologist

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Some Bees from New Zealand, T. D. A. Cockerell; Annals and Magazine of Natural History

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Some Bees from the Pyrenees, T. D. A. Cockerell; The Entomologist

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Some Halictine Bees from the Maritime Province of Siberia [On the Insect Fauna of the Maritime Province of Siberia], T. D. A. Cockerell; Proceedings of the United States National Museum

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Some Parasitic Bees of the Pacific Coast Region, T. D. A. Cockerell; The Pan-Pacific Entomologist

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Some Philippine Bees, T. D. A. Cockerell; The Philippine Journal of Science

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Tertiary Insects from Kudia River, Maritime Province, Siberia, T. D. A. Cockerell; Proceedings of the United States National Museum

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The Entomology of the Gulf of California, T. D. A. Cockerell; The Pan-Pacific Entomologist

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XI: Bees in the Collection of California Academy of Sciences, T. D. A. Cockerell; Proceedings of the California Academy of Sciences

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XV: Anthidiine Bees in the Collection of the California Academy of Sciences, T. D. A. Cockerell; Proceedings of the California Academy of Sciences

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Bees from Samar, Philippine Islands, T. D. A. Cockerell and Norma LeVeque; The Philippine Journal of Science

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Les Osmies de la Belgique, A. Crèvecoeur; Bull. & Ann. de la Soc. Entom. de Belg.

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Notes on Some Indian bees in the British Museum, Cedric Dover; Annals and Magazine of Natural History

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The New Forms of Bumblebees, A. Skorikov; Rev. Russe. Ent.

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On the Bumblebee Fauna of Yaroslav Goubernia, A. S. Skorikov

1924

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Andrena japonica Alfk., J. D. Alfken; Sonder-Abdruck aus Kowonia

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Andrena rutila Spin. Und ihre Farbungsformen. (Hym. Apid.), J. D. Alfken; Deutsch. Ent. Zeitschr.

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Beitrag zur Kenntnis einiger Bienen Finlands, J. D. Alfken; Notulae Entomologicae

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Die Insekten des Memmert. Zum Problem der Besiedelung einer neuentstehenden Insel., J. D. Alfken; Abhandl. Naturwissen. vereinBremen

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Die vier froßen Megachile-Arten Deutschlands, J. D. Alfken; Konowia Vienna

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Megachile centuncularis L. und ihre Verwandten, J. D. Alfken; Deutsch. Ent. Zeitschr.

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Przyczynek do znajomosci kilku gatunkow z grupy Megachile argentata, J. D. Alfken

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Zur Kenntnis der Megachile-Arten von Formosa, J. D. Alfken; Sonder-Abdruck aus Konowia

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Notes on Miltogramminae with Descriptions of Two New Species, H. W. Allen; Occasional Papers of the Boston Society of Natural History

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Insects Emerging from Hickory, M. W. Blackman, H. H. Stage, and Richard Dow Rhoads

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A New Bee from Oregon, T. D. A. Cockerell; Psyche

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Anthophorid Bees in the Collection of the California Academy of Sciences, T. D. A. Cockerell; The Pan-Pacific Entomologist

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Bees from the Tonga and Samoa Islands, T. D. A. Cockerell; Annals of the Entomological Society of America

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Bees of the Genus Andrena in the Collection of the California Academy of Sciences, T. D. A. Cockerell; The Pan-Pacific Entomologist

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Descriptions and Records of Bees — C, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — CI, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — CII, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — CIII, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — XCIX, T. D. A. Cockerell; Annals and Magazine of Natural History

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New Anthophorid Bees from Arizona and Wyoming, T. D. A. Cockerell; American Museum Novitates

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Notes on the Structure of Bees, T. D. A. Cockerell; Proceedings of the Entomological Society of Washington

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XXVII: Expedition of the California Academy of Sciences to the Gulf of California in 1921: The Bees (II), T. D. A. Cockerell; Proceedings of the California Academy of Sciences

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XIX: Parasitic Bees (Epeolinæ and Melectinæ) in the Collection of the California Academy of Sciences, T. D. A. Cockerell and Grace Sandhouse; Proceedings of the California Academy of Sciences

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Les Nids D'Hymenopteres, Leon Marcel Coulon; Societe d'etude des Sciences Naturelles d'Elbeuf

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Recherches sur la Sexualite et l'Instinct Chez les Hymenopteres, Armand Descy; Bull. Bio. De la France et de la Belgique

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A Key to the Indian Species of the Genus Osmia Panz. (Apidae), Cedric Dover; The Entomologist

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Las "Xylocopa" (Hymen. Apidae) en las Colecciones de Madrid, José María Dumset Y Alonso; Trabajos del Museo Nacional de Ciencias Naturales

1923

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Eine neue Prosopis-Art aus Palastina., J. D. Alfken; Sonderbruck aus Konowia

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8. The South and Central African Species of the Genus Synagris Latreille (Hymenoptera), Joseph Bequaert; Annals of the South African Museum

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Enkele beschouwingen over kleuren en kleurgroepen bij Plooivleugelige Wespen, (1), Joseph Bequaert; Natuurwetenschappelijik Tijdschrift

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Vestigial Pleometrosis in the North American Polistes Pallipes Lepeletier, Joseph Bequaert; Bulletin of the Brooklyn Entomological Society

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On the succession of insects living in the bark and wood of dying, dead, and decaying hickory., M. W. Blackman and H. H. Stage

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Zur Biologie der Bienengattung Sphecodes Latr. (Hym.), Paul Blüthgen; Zeitschrift f. wiss. Ins.-Biologie

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Onze Metselbijen (Osmia), B. E. Bouwman; De Levende Natuur

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Humble Bees at Roundhay, Leeds, A. E. Bradley; The Naturalist

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A New Dasymutilla From Arizona, James Chester Bradley and J. Bequaert; American Museum Novitates

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Experimental Pollination; an Outline of the Ecology of Flowers and Insects 5. Pollinators and Flowers Visited & 6. Flowers and Their Visitors, Frederic E. Clements and Frances L. Long; Carnegie Inst. Wash. Pub.

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A Bee-Collecting Trip Across the Plains (Hym. : Apoidea, Sphecoidea), T. D. A. Cockerell; Entomological News

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Descriptions and Records of Bees — XCVII, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees — XCVIII, T. D. A. Cockerell; Annals and Magazine of Natural History

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Some Bees from British Guiana, T. D. A. Cockerell; Annals and Magazine of Natural History

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Some Bees from Victoria, Mexico, T. D. A. Cockerell; Proceedings of the United States National Museum

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Some Colorado Bees, T. D. A. Cockerell; The Canadian Entomologist

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Two Fossil Hymenoptera from Florissant (Vespidae, Megachilidae), T. D. A. Cockerell; Entomological News

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Two Nocturnal Bees and a Minute Perdita, T. D. A. Cockerell; American Museum Novitates

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Two Nocturnal Bees and a Minute Perdita, T. D. A. Cockerell; American Museum Novitates

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VII: Expedition of the California Academy of Sciences to the Gulf of California in 1921: The Bees (I), T. D. A. Cockerell; Proceedings of the California Academy of Sciences

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A Comparison of the Labium in Certain Holometabolous Insects from the Standpoint of Phylogeny, G. C. Crampton; Proceedings of the Entomological Society of Washington

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Los Ápidos de España VI. Géneros Xylocopa Latr. Y Ceratina Latr., José María Dumset Y Alonso; Memorias de la Real Sociedad Española de Historia Natural

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Zur Kenntnis der Lebenweise von Sphex pachysoma Kohl., Josef Fahringer; Zeitschrift f. Wiss. Ths. Biologie

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Descriptions of Two New Species of Encyrtidae From Mexico Reared from Mealy-Bugs (Hym., Chalcidoidea), Philip H. Timberlake; Proceedings of the Hawaiian Entomological Society

1922

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Wissenschaftliche Ergebnisse Der Mit Unterstutzung Der Akademie Der Wissenschaften In Wien Aus Der Erbschaft Treitl Von F. Werner Unternommenen Zoologischen Expedition Nach Dem Anglo-Agyptischen Sudan (Kordofan) 1914 XVI. Hymenoptera F. Apidae, J. D. Alfken

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Hymenopteres Melliferes nouveaux pour la faune francaise, R. Benoist; Bulletin de la Société Entomologique de France

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III. The Predaceous Enemies of Ants, Joseph Bequaert; Bulletin of the American Museum of Natural History

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The Taxonomy of the Masarid Wasps, Including a Monograph on the North American Species, James Chester Bradley; University of California Publications in Entomology

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Life-history of Melittobia acasta, L. Balfour Browne; Parasitology

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Some Hymenopterous Parasites of Lignicolous Itonididae, Charles Thomas Brues; Proceedings of the American Academy of Arts and Sciences

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Sunflower Studies, P. V. Cardon; Journal of the American Society of Agronomy

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Australian Bees in the Queensland Museum, T. D. A. Cockerell; Memoirs of the Queensland Museum

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Bees in the Collection of the United States National Museum. -4, T. D. A. Cockerell; Proceedings of the United States National Museum

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Bees of the Genus Panurginus Obtained by the American Museum Rocky Mountain Expeditions, T. D. A. Cockerell; American Museum Novitates

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Bees of the Genus Perdita from the Western States, T. D. A. Cockerell; American Museum Novitates

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Descriptions and Records of Bees - XCII, T. D. A. Cockerell; Annals and Magazine of Natural History

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Descriptions and Records of Bees - XCIII, T. D. A. Cockerell; Annals and Magazine of Natural History