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Pierre François Marie Auguste Dejean

French entomologist

Pierre François Marie Auguste Dejean
Comte Dejean
Born	(1780-08-10)10 August 1780 Amiens
Died	17 March 1845(1845-03-17) (aged 64) Paris
Nationality	French
Scientific career
Fields	Entomology
Institutions	Société entomologique de France Royal Swedish Academy of Sciences

Pierre François Marie Auguste Dejean (French pronunciation: [pjɛʁ fʁɑ̃swa maʁi oɡyst dəʒɑ̃]; 10 August 1780 – 17 March 1845), was a French soldier and entomologist. Dejean described a large number of beetles in a series of catalogues.

A soldier of fortune during the Napoleonic Wars, he rose to the rank of lieutenant general and aide de campetoNapoleon. He amassed vast collections of Coleoptera, some even collected on the battlefield at Waterloo. At the battle of Alcanizas he took time out of battle to pick up a beetle that he pinned on to cork on the inside of his helmet. After victory, he was pleased to find the beetle intact.^[1] He listed 22,399 species in his cabinets in 1837—at the time, the greatest collection of Coleoptera in the world. In 1802, he began publishing a catalogue of his vast collection, including 22,000 species names. Dejean was an opponent of the Principle of Priorityinnomenclature. "I have made it a rule always to preserve the name most generally used , and not the oldest one; because it seems to me that general usage should always be followed and that it is harmful to change what has already been established". Dejean acted accordingly and often introduced in litteris names, given by himself to replace those already published by other authors. They became invalid. Dejean was president of the Société entomologique de France for the year 1840. In 1834, he was elected a foreign member of the Royal Swedish Academy of Sciences. He died on 17 March 1845.

• Catalogue des Coléoptères de la collection d'Auguste Dejean (1802)
• Catalogue de la collection de Coléoptères de M. le Baron Dejean (1821)
• Catalogue des Coléoptères de la collection de M. le Comte Dejean (1833–1836)
• Catalogue des Coléoptères de la collection de M. le Comte Dejean. Troisième édition, revue, corrigée et augmentée. (1836–1837)
• with Pierre André Latreille Histoire naturelle et iconographie des insectes coléoptères d'Europe Paris : Crevot, 1822. digitised at Gallica.
• Spécies Général des Coléoptères, de la collection de M. le Comte Dejean (1825–1838)

• Carabus sylvestris transsylvanicus, described in 1826

• d'Aguilar, J. 2008, Dejean, une légende entomologique. Insectes (149): 17-18
• Barber, H. S. and Bridwell, J. C., 1940 Dejean Catalogue names (Coleoptera). Bulletin of the Brooklyn Entomological Society, Lancaster, Pa. 35 (1): 1-12[1]
• Madge, R. B. 1988, [Dejean, P. F. M. A.] Arch. Nat. Hist., London 15 (3): 317-321
• Peyerimhoff, P. de 1932, La Société entomologique de France (1832–1931). Soc. Ent. France, Livre du Centenaire, Paris : 1-86m Plates. I-XIII

Wikimedia Commons has media related to Pierre François Marie Auguste Dejean.

• Portrait and Short account of Dejean
• Internet Archive Spècies Général des Coléoptères, de la collection de M. le Comte Dejean Volume 1
• Internet Archive Spècies Général des Coléoptères, de la collection de M. le Comte Dejean Volume 2
• Internet Archive Spècies Général des Coléoptères, de la collection de M. le Comte Dejean Volume 3
• Internet Archive Spècies Général des Coléoptères, de la collection de M. le Comte Dejean Volume 4
• Internet Archive Spècies Général des Coléoptères, de la collection de M. le Comte Dejean Volume 5
• Internet Archive Spècies Général des Coléoptères, de la collection de M. le Comte Dejean Volume 6 (Species général des hydrocanthares et gyriniens, by Charles Aubé)
• Gaedike, R.; Groll, E. K. & Taeger, A. 2012: Bibliography of the entomological literature from the beginning until 1863 : online database - version 1.0 - Senckenberg Deutsches Entomologisches Institut. Links to collection details and biographies.