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1926
Hymenoptera, Philip H. Timberlake; Bernice P. Bishop Museum Bulletin
Шмепи (Bombidae.)., A. П. Белизин
1925
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
Prosopis meridionalis Forst. (Hym. Apid.), J. D. Alfken; Deutsch. Ent. Zeitschr.
Ueber das Mannchen von Liris haemorrhoidalis F. (Hymen.), J. D. Alfken; Sonderabdruck
Zwei neue indische Prosopis-Arten und uber die 3 grossen indischen Xylocopa-Species (Apid.), J. D. Alfken; Entomologische Mitteilungen
Neues zum Hummelproblem, Paul Peter Babiy; Zeitschrift f. wissensch Zoologie
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
The Genus Ancistrocerus (Hymenoptera, Vespidae) in North America, with a partial key to the species, Joseph Bequaert; Transactions of the American Entomological Society
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
Beiträge zur Kenntnis der Bienengattung Halictus Latr. II., Paul Blüthgen; Archiv für Naturgeschichte
Beiträge zur Kenntnis der Hymenopterenfauna des Saaletals, Paul Blüthgen; Stettiner Entomologische Zeitung
Onze Behangersbijen (Megachile), B. E. Bouwman; De Levende Natuur
Some Species of the Genus Leucospis, Charles Thomas Brues; Psyche
La Voie Bucco-Pharyngée Chez la Scolie, L'abeille Maçonne et la Xylocope Violette, E. Bugnion; Bull. Soc. Zool. Paris
Bees of the Genus Cœlioxys in the Collection of the California Academy of Sciences, T. D. A. Cockerell; The Pan-Pacific Entomologist
Descriptions and Records of Bees — CIV, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — CV, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — CVI, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — CVII, T. D. A. Cockerell; Annals and Magazine of Natural History
Diploplectron in California (Hymen. : Sphegoidea), T. D. A. Cockerell; Entomological News
Some Bees Collected by Mr. P. H. Timberlake at Riverside, California, T. D. A. Cockerell; The Pan-Pacific Entomologist
Some Bees from New Zealand, T. D. A. Cockerell; Annals and Magazine of Natural History
Some Bees from the Pyrenees, T. D. A. Cockerell; The Entomologist
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
Some Parasitic Bees of the Pacific Coast Region, T. D. A. Cockerell; The Pan-Pacific Entomologist
Some Philippine Bees, T. D. A. Cockerell; The Philippine Journal of Science
Tertiary Insects from Kudia River, Maritime Province, Siberia, T. D. A. Cockerell; Proceedings of the United States National Museum
The Entomology of the Gulf of California, T. D. A. Cockerell; The Pan-Pacific Entomologist
XI: Bees in the Collection of California Academy of Sciences, T. D. A. Cockerell; Proceedings of the California Academy of Sciences
XV: Anthidiine Bees in the Collection of the California Academy of Sciences, T. D. A. Cockerell; Proceedings of the California Academy of Sciences
Bees from Samar, Philippine Islands, T. D. A. Cockerell and Norma LeVeque; The Philippine Journal of Science
Les Osmies de la Belgique, A. Crèvecoeur; Bull. & Ann. de la Soc. Entom. de Belg.
Notes on Some Indian bees in the British Museum, Cedric Dover; Annals and Magazine of Natural History
The New Forms of Bumblebees, A. Skorikov; Rev. Russe. Ent.
On the Bumblebee Fauna of Yaroslav Goubernia, A. S. Skorikov
1924
Andrena japonica Alfk., J. D. Alfken; Sonder-Abdruck aus Kowonia
Andrena rutila Spin. Und ihre Farbungsformen. (Hym. Apid.), J. D. Alfken; Deutsch. Ent. Zeitschr.
Beitrag zur Kenntnis einiger Bienen Finlands, J. D. Alfken; Notulae Entomologicae
Die Insekten des Memmert. Zum Problem der Besiedelung einer neuentstehenden Insel., J. D. Alfken; Abhandl. Naturwissen. vereinBremen
Die vier froßen Megachile-Arten Deutschlands, J. D. Alfken; Konowia Vienna
Megachile centuncularis L. und ihre Verwandten, J. D. Alfken; Deutsch. Ent. Zeitschr.
Przyczynek do znajomosci kilku gatunkow z grupy Megachile argentata, J. D. Alfken
Zur Kenntnis der Megachile-Arten von Formosa, J. D. Alfken; Sonder-Abdruck aus Konowia
Notes on Miltogramminae with Descriptions of Two New Species, H. W. Allen; Occasional Papers of the Boston Society of Natural History
Insects Emerging from Hickory, M. W. Blackman, H. H. Stage, and Richard Dow Rhoads
A New Bee from Oregon, T. D. A. Cockerell; Psyche
Anthophorid Bees in the Collection of the California Academy of Sciences, T. D. A. Cockerell; The Pan-Pacific Entomologist
Bees from the Tonga and Samoa Islands, T. D. A. Cockerell; Annals of the Entomological Society of America
Bees of the Genus Andrena in the Collection of the California Academy of Sciences, T. D. A. Cockerell; The Pan-Pacific Entomologist
Descriptions and Records of Bees — C, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — CI, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — CII, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — CIII, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — XCIX, T. D. A. Cockerell; Annals and Magazine of Natural History
New Anthophorid Bees from Arizona and Wyoming, T. D. A. Cockerell; American Museum Novitates
Notes on the Structure of Bees, T. D. A. Cockerell; Proceedings of the Entomological Society of Washington
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
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
Les Nids D'Hymenopteres, Leon Marcel Coulon; Societe d'etude des Sciences Naturelles d'Elbeuf
Recherches sur la Sexualite et l'Instinct Chez les Hymenopteres, Armand Descy; Bull. Bio. De la France et de la Belgique
A Key to the Indian Species of the Genus Osmia Panz. (Apidae), Cedric Dover; The Entomologist
Las "Xylocopa" (Hymen. Apidae) en las Colecciones de Madrid, José María Dumset Y Alonso; Trabajos del Museo Nacional de Ciencias Naturales
1923
Eine neue Prosopis-Art aus Palastina., J. D. Alfken; Sonderbruck aus Konowia
8. The South and Central African Species of the Genus Synagris Latreille (Hymenoptera), Joseph Bequaert; Annals of the South African Museum
Enkele beschouwingen over kleuren en kleurgroepen bij Plooivleugelige Wespen, (1), Joseph Bequaert; Natuurwetenschappelijik Tijdschrift
Vestigial Pleometrosis in the North American Polistes Pallipes Lepeletier, Joseph Bequaert; Bulletin of the Brooklyn Entomological Society
On the succession of insects living in the bark and wood of dying, dead, and decaying hickory., M. W. Blackman and H. H. Stage
Zur Biologie der Bienengattung Sphecodes Latr. (Hym.), Paul Blüthgen; Zeitschrift f. wiss. Ins.-Biologie
Onze Metselbijen (Osmia), B. E. Bouwman; De Levende Natuur
Humble Bees at Roundhay, Leeds, A. E. Bradley; The Naturalist
A New Dasymutilla From Arizona, James Chester Bradley and J. Bequaert; American Museum Novitates
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.
A Bee-Collecting Trip Across the Plains (Hym. : Apoidea, Sphecoidea), T. D. A. Cockerell; Entomological News
Descriptions and Records of Bees — XCVII, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees — XCVIII, T. D. A. Cockerell; Annals and Magazine of Natural History
Some Bees from British Guiana, T. D. A. Cockerell; Annals and Magazine of Natural History
Some Bees from Victoria, Mexico, T. D. A. Cockerell; Proceedings of the United States National Museum
Some Colorado Bees, T. D. A. Cockerell; The Canadian Entomologist
Two Fossil Hymenoptera from Florissant (Vespidae, Megachilidae), T. D. A. Cockerell; Entomological News
Two Nocturnal Bees and a Minute Perdita, T. D. A. Cockerell; American Museum Novitates
Two Nocturnal Bees and a Minute Perdita, T. D. A. Cockerell; American Museum Novitates
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
A Comparison of the Labium in Certain Holometabolous Insects from the Standpoint of Phylogeny, G. C. Crampton; Proceedings of the Entomological Society of Washington
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
Zur Kenntnis der Lebenweise von Sphex pachysoma Kohl., Josef Fahringer; Zeitschrift f. Wiss. Ths. Biologie
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
Hymenopteres Melliferes nouveaux pour la faune francaise, R. Benoist; Bulletin de la Société Entomologique de France
III. The Predaceous Enemies of Ants, Joseph Bequaert; Bulletin of the American Museum of Natural History
The Taxonomy of the Masarid Wasps, Including a Monograph on the North American Species, James Chester Bradley; University of California Publications in Entomology
Life-history of Melittobia acasta, L. Balfour Browne; Parasitology
Some Hymenopterous Parasites of Lignicolous Itonididae, Charles Thomas Brues; Proceedings of the American Academy of Arts and Sciences
Sunflower Studies, P. V. Cardon; Journal of the American Society of Agronomy
Australian Bees in the Queensland Museum, T. D. A. Cockerell; Memoirs of the Queensland Museum
Bees in the Collection of the United States National Museum. -4, T. D. A. Cockerell; Proceedings of the United States National Museum
Bees of the Genus Panurginus Obtained by the American Museum Rocky Mountain Expeditions, T. D. A. Cockerell; American Museum Novitates
Bees of the Genus Perdita from the Western States, T. D. A. Cockerell; American Museum Novitates
Descriptions and Records of Bees - XCII, T. D. A. Cockerell; Annals and Magazine of Natural History
Descriptions and Records of Bees - XCIII, T. D. A. Cockerell; Annals and Magazine of Natural History