Walter Reed, a United States Army major, was appointed president of a board "to study infectious diseases in Cuba paying particular attention to yellow fever." He concurred with Carlos Finlay in identifying mosquitoes as the agent.
Ignacio Bolívar y Urrutia publishes Catálogo sinóptico de los ortópteros de la fauna ibérica.
Kálmán Kertész, Mario Bezzi, Paul Stein (entomologist) and Theodor Becker published the first part of a Palaearctic Catalogue of Diptera Katalog der Paläarktischen dipteren in Budapest.
1901
William Francis de Vismes Kane A catalogue of the Lepidoptera of Ireland-the third (and first comprehensive) catalogue of the Irish macrolepidoptera.
Augustus Daniel Imms General textbook of Entomology published. 10th revised edition (1977) still one of the most widely used of all insect texts.
August Arthur Petry publishes Ueber die deutschen an Artemisia lebenden Arten der Gattung Bucculatrix Z. nebst Beschreibung einer neuen Art in Deutsche entomologische Zeitschrift Iris
Peter Esben-Petersen publishes Bidrag til en Fortegnelse over Arktisk Norges Neuropterfauna
1905
Adolfo Lutz Beitraege zur Kenntniss der brasilianischen Tabaniden. Rev. Soc. Sci. São Paulo 1: 19–32, published
Raphaël Blanchard Les moustiques. Histoire naturelle et médicale Paris, F.R. de Rudeval, published.
Gabriel Höfner Die Schmetterlinge Kärntens (1905-1915)
1906
Adalbert Seitz, Gross-Schmetterlinge der Erde commenced. This vast work on Lepidoptera was published in German, English and French. It contained colour plates of all important species.
1907
William Lundbeck Diptera Danica. Genera and species of flies Hitherto found in Denmark commenced.
Hamilton Herbert Druce On Neotropical Lycaenidae, with Descriptions of New Species. Proceedings of the Zoological Society of London.
Henry Christopher McCook Nature's Craftsmen: Popular Studies of Ants and Other Insects.
Lajos Abafi Magyarország lepkéi (butterflies of Hungary) 1907
1908
Edmund Reitter Fauna Germanica - Die Käfer des Deutschen Reiches commenced. This five volume masterwork remains in use today, almost 100 years from its inception.
Leonello Picco Contributo allo studio della fauna entomologica Italiano. Elenco sistematico degli Emitteri finora raccolti nella Provincia di Roma.
Arnold Spuler and Ernst Hofmann Die Schmetterlinge Europas (The Lepidoptera of Europe) was for decades a standard in the study of lepidoptera.
1909
George Henry Verrall Stratiomyidae and succeeding families of the Diptera Brachycera of Great Britain - British flies published.
Carlos Chagas observed the peculiar infestation of rural houses in Brazil with Triatoma, a "kissing" bug, later demonstrating that it was the vector of Trypanosoma cruzi, and he was able to prove experimentally that it could be transmitted to marmoset monkeys that were bitten by the infected bug. His description of the new disease was to become a classic in medicine and brought him domestic and international distinction.
Charles Nicolle reasoned that it was most likely lice that were the vector for epidemic typhus. He tested his theory by infecting a chimpanzee with typhus, retrieving the lice from it, and placing it on a healthy chimpanzee. Within 10 days the second chimpanzee had typhus as well.
Antonio Berlese Volume I of Gli insetti loro organizzazione, sviluppo, abitudini e rapporti con l'uomo (Volume 2 1925).
Arnold Pagenstecher Die geographische Verbreitung der Schmetterlinge published in Jena.
Foundation of Journal of Entomology by Charles Fuller Baker, one of the first revues of economic entomology.
Murinus Cornelius Piepers, Pieter Cornelius Tobias Snellen and Hans Fruhstorfer. The Rhopalocera of Java commenced. Completed 1918.
Friedrich Georg Hendel Die Arten der Platystominen. Abh. Zool.-Bot. Ges. Wien 8 (1): 1–409, 4 pls. published
Filippo Silvestri Contribuzione alla conoscenza dei Termitidi e Termitofili dell'Africa occidentale. Bollettino del Laboratorio di Zoologia General e Agraria, Portici.
1915
Nathan Banks A Treatise on the Acarina, Or Mites the first comprehensive English handbook on mites.
Frederick William Frohawk's Natural History of British Butterflies published.
1925
Frank M. Carpenter begins work on the Elmo Permian fossil fauna.
Josef Fahringer Opuscula braconolocica (4 parts, finished 1937) begun.
1927
Ronald A. Senior-White and Robert Knowles (entomologist) Malaria: Its Investigation and Control, with Special Reference to Indian Conditions. Calcutta: Thacker, Spink and Co published.
José María Hugo de la Fuente Morales Tablas analíticas para la clasificación de los coleópteros de la Península Ibérica. Barcelona Imprenta Altés, published.
Zeno Payne Metcalf commenced (as overall editor and author of the Homoptera sections) General Catalogue of the Hemiptera. Completed 1971.
1928
Jan Noskiewicz with G. Poluszynski Embryologische Untersuchungen an Strepsipteren. I. Teil: Embryogenesis der Gattung Stylops Kirby. Akad. Umiejetnosci..
Alexander Kirilow Drenowski The Lepidoptera fauna on the high mountains of Bulgaria Sbornik bulg. Akad. Nauk. 23: 1–120, 1 map, published.
1930
Camillo Acqua Il bombice del Gelso:Nello stato normale e patologico nella tecnica dell'allevamento e della riproduzione. (Industria della preparazione del seme Bachi)-Enc. tela. Casa Ed. di Giuseppe Cesari, published. This was an important contribution to the literature on sericulture.
1931
Georg Hermann Alexander Ochs publishes Über die Gyriniden-Ausbeute der Deutschen Limnologischen Sunda-Expedition mit einer Übersicht über die Gyriniden-Fauna Javas und Larvenbeschreibungen.
Shonen Matsumura 6,000 illustrated Insects of Japan-Empire.
1932
A Practical Handbook of British Beetles by Norman H. Joy published by Witherby.
Alfred Balachowsky Étude biologique des coccides du bassin occidental de la Méditerranée published in Paris by Lechevalier and Fils.
Ruggero Verity commenced Farfalle, in English Butterflies, of Italia (five volumes, 1940–1953).
René Jeannel Faune cavernicole de la France, in English The Fauna of the Caves of France, published.
1941
Zoltán Szilády A magyar birodalom legyeinek szinopszisa. VI. Talpaslegyek, Clythidae (Platypezidae); VIII. Lauxaniidae [Synopsis of the flies of the Hungarian empire].
Adolf Horion Faunistik der Mitteleuropäischen Käfer commenced. Completed 1974.
1942
Woodhouse, L. G. O. & George Morrison Reid Henry. The Butterfly Fauna of Ceylon. Government Record Office, Colombo
1943
André Badonnel Faune de France. Psocoptères. Paris. Paul Lechevalier 1943.
Leopold Fulmek Wirtsindex der Aleyrodiden- und Cocciden- Parasiten Entomologische Beihefte 10: 1–100.
1944
Enrica Calabresi commits suicide in Florence.
1945
Edmund Brisco FordButterflies published, seminal introduction to the study of butterflies and their genetics.
Sakae Tamura Konchū no seitai: Raika shashinshū (昆虫の生態:ライカ写眞集) or Closeups on Insects. Tokyo: Seibundo-Shinkosha
Torkel Weis-Fogh pioneered studies of insect flight with August Krogh.
1952
Bernard Kettlewell begins research into the influence of industrial melanism on natural selection in moths.
Crodowaldo Pavan introduced into biology the cytogenetical study of Rhynchosciara americana.
1953
Willi Hennig publishes Grundzüge einer Theorie der phylogenetischen Systematikin Berlin. This was followed by Kritische Bemerkungen zum phylogenetischen System der Insekten in 1953 and Phylogenetic Systematics in 1966. In these works, Hennig founded cladistics.
Sydney Skaife African Insect Life published.
Catalogue illustré des lucanides du globe in Encyclopédie Entomologique (series A 27: 1-223) by Robert Didier and Eugene Seguy published.
World programme for malaria eradication begins. Finally abandoned 1969.
Roy Albert Crowson's The natural classification of the families of Coleoptera is published. This is a classic monograph.
Alexey Diakonoff Microlepidoptera of New Guinea. Results of the third Archbold Expedition (American- Netherlands Indian Expedition 1938-1939). Part V. Verhandelingen der Koninklijke Nederlandse published 15 years after the expedition.
1957
Clodoveo Carrión Mora in 1925
Clodoveo Carrión Mora dies in Ecuador. Mora was a leading figure entomology of 20th-century entomology in South America.
1960
Czesław Bieżanko publishes Álbum iconográfico dos Lepidópteros coletados por Biezanko. Papilionidae.
Marta Grandi Ephemeroidea. Fauna d'Italia
1961
Space-filling model of a section of DNA molecule.
Genetic code is cracked. DNA was discovered by Friedrich Miescher in 1868, recognized as the bearer of genetic information in 1943 and revealed as a double helix by Rosalind Franklin in 1952. This leads to radical revision of the higher taxonomy of the Insecta.
1964
Morris Rockstein's edited series — 3 vols. — The Physiology of Insecta
Takashi Shirozu Butterflies of Japan Illustrated in Colour published in Tokyo by Hokuryu-kan.
1965
Nikolai Sergeevich Borchsenius Essay on the classification of the armoured scale insects (Homoptera, Coccoidea, Diaspididae). (In Russian.) Entomologicheskoe Obozrenye 44: 208–214.
1966
First international Red Lists of endangered species were published.
1967
Richard E. Blackwelder Taxonomy: a Text and Reference Book John. Wiley and Sons, New York, published.
1968
David Allan Young Taxonomic Study of the Cicadellinae (Homoptera: Cicadellidae) commenced. Finished 1986.
1969
Reg Chapman's textbook appears — The Insects-Structure and Function. American Elsevier, N.Y.
International Centre of Insect Physiology and Ecology established.
1971
Maximilian Fischer Index of Entomophagous Insects. Le Francois, Paris.
Warwick Estevam Kerr Evolution of the population structure in bees. Genetics 79: 73–84.
1976
Anastase Alfieri The Coleoptera of Egypt published.
1981
Robert Michael Pyle published The National Audubon SocietyField Guide to North American Butterflies. Knopf.
1981
CESA Centre for Entomological Studies Ankara An international private research centre and museum on Entomology established by Ahmet Omer Kocak in Ankara, Turkey.
1984
Árpád Soós and Lazlo Papp begin editing Catalogue of Palaearctic Diptera.1984 - 1992.
An insect coated in gold, having been prepared for viewing with a scanning electron microscope.
Bert Hölldobler and E. O. Wilson publish The Ants. The following year, it will be the only entomology textbook to win the Pulitzer Prize for non-fiction.
Naumann, I. D., P. B. Carne, J. F. Lawrence, E. S. Nielsen, J. P. Spradberry, R. W. Taylor, M. J. Whitten and M. J. Littlejohn, eds. The Insects of Australia: A Textbook for Students and Research Workers. Volume I and II. Second Edition. Carlton, Victoria, Melbourne University Press.
1993
Edward Grumbine, Ghost Bears: Exploring the Biodiversity Crisis reflects growing concerns. Insects are major indicators of environmental destruction and impending mass extinction.
1994
Hoy, M. Insect molecular genetics. An introduction to principles and applications.
Vladimir Nikolayevich Beklemishev Методология систематики (Methodology of systematics).KMK Scientific Press Ltd.
1995
Yuri Petrovich Korshunov and Pavel Yunievich Gorbunov Butterflies of the Urals, Siberia and Far East published.
Loïc Matile Diptères d'Europe Occidentale Tomes 1 and 2 Atlas d'Entomologie.Editions N. Boubée.Paris.
2001
First volume of American Beetles published. Ross H. Arnett, Jr. and Michael C. Thomas.
2002
Alex Rasnitsyn with D.L.J. Quicke History of Insects. Kluwer Academic Publishers.
2004
Gilbert, L.I. (ed.). 2004. Comprehensive molecular insect science, 7 vols. Elsevier Pergamon, published in St. Louis
A paper in Science found that Culex pipiens mosquitoes existed in two populations in Europe, one which bites birds and one which bites humans. In North America 40% of Culex pipiens were found to be hybrids of the two types which bite both birds and humans, providing a vector for West Nile virus. This is thought to provide an explanation of why the West Nile disease has spread more quickly in North America than Europe.