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Napoleon general was prolific beetle collector

This is a portrait of Count Pierre Dejean, a huge collector of beetles.
This is a portrait of Count Pierre Dejean, a huge collector of beetles.Lithographie par Jacques Llanta

By Megan Gannon


Count Pierre Dejean may have been a general in Napoleon Bonaparte's army, but he was perhaps more intimidating as a beetle collector.

By the time he died in 1845, Dejean had amassed a daunting collection of 24,643 species of beetles and more than 118,000 specimens, some of them scooped up from battlefields. At the time, it was the largest beetle collection ever assembled by one person, researchers say. Scientists have only now updated the catalogs Dejean wrote to describe his impressive collection.

Born in 1780, Dejean developed an early interest in insects, hoarding butterflies and moths (both in the order Lepidoptera) as a boy before graduating to the order of Coleoptera, or beetles, which became his lifelong passion. Dejean's youngest daughter, in the preface of one of her poetry books, recalls an episode of her father's obsession from one of his war stories: "He recounted himself that during the battle he stopped his horse to attach a small insect to his helmet and then carried on forward to combat."

This is an image of Batocera wallacei Thomson, 1858 from Australasia, which belongs to the genus Batocera Dejean, 1835.
This is an image of Batocera wallacei Thomson, 1858 from Australasia, which belongs to the genus Batocera Dejean, 1835.Udo Schmidt

Napoleon's campaigns took Dejean to Spain, Portugal, Italy, Austria, Poland, Germany and Russia, where beetle specimens became his spoils of war. When Napoleon fell in 1815, Dejean (who served as a field assistant to the commander himself at Waterloo) used his exile in the Austrian empire as an opportunity to keep collecting. After he returned to France, he bankrolled collecting expeditions and bought a number of collections, including that of entomologist Pierre André Latreille, which added 1,700 species to Dejean's collection. [Image Gallery: Shimmering Metallic Beetles]

Over his lifetime, Dejean published four catalogs of the beetles in his collection, including many species that had yet to be formally described by scientists. Taxonomists and collectors often proposed scientific names for new species they found during the 19th century, but specimens were often exchanged, sold or given away before they officially entered scientific literature, researchers say.

To relieve some of confusion around Dejean's specimens, researchers Yves Bousquet and Patrice Bouchard, of the Canadian National Collection of Insects, Arachnids and Nematodes, took a crack at Dejean's catalogs and for the first time provided a detailed nomenclatural summary of all generic names for the general's Coleoptera collection.

"While working on a number of catalogs in the past, it became clear to us that the generic names in Dejean's second and third catalogs had been a source of confusion." Bousquet and Bouchard said in a statement. "While experts of some groups in Coleoptera had consistently applied the rules of nomenclature to deal with these names, genera in other groups were often misused or had been completely ignored."

For beetle buffs eager to peruse the updated catalog, the journal ZooKeys made it available online this week.

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