Pierre François Marie Auguste Dejean

Pierre François Marie Auguste Dejean (10 August 1780 – 17 March 1845), was a French entomologist. A soldier of fortune during the Napoleonic Wars, he rose to the rank of lieutenant general and aide de campe to Napoleon. He amassed vast collections of Coleoptera, some even collected on the battlefield at Waterloo. 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 Priority in nomenclature. "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.

Pierre François Marie Auguste Dejean
Auguste Dejean 1780-1845.jpg
Comte Dejean
Born(1780-08-10)10 August 1780
Died17 March 1845(1845-03-17) (aged 64)
Scientific career
InstitutionsSociété entomologique de France
Royal Swedish Academy of Sciences


  • 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)


  • 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
  • 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

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