Pierre André Latreille: How a Beetle Saved an Imprisoned Entomologist From the Guillotine


Pierre André Latreille, Courtesy of Bibliothèque nationale de France
Pierre André Latreille. Courtesy of Bibliothèque nationale de France.

Pierre André Latreille was a French zoologist who specialized in arthropods. However, he became known as the “foremost entomologist” of his time after he was imprisoned and discovered a rare beetle. His fascinating story begins when he was born on 29 November 1762 in the town of Brive. He was the illegitimate child of and unknown woman and Jean Joseph Sahuguet d’Amarzit, général baron d’Espagnac. A few years after his birth, he was orphaned, but luckily he was adopted by  famous mineralogist, Abbé Haüy.

Haüy insured he got a good education and his education began at the Collège du Cardinal Lemoine in Brive. It was later continued in Paris when he was taken there at the age of sixteen. In school, he became interested in natural history and received lessons about botany from René Just Haüy. He also met Jean-Baptiste Lamarck, the French naturalist who was an early proponent of evolution. In addition, because of Latreille’s interest in natural history, he visited the Jardin du Roi often and began searching for insects wherever he went.

After Latreille graduated as a Deacon, the French Revolution broke out. In 1790, the Civil Constitution of the Clergy was declared. This law required clergymen to take an oath that they would guard with care the dioceses confided to them, support the constitution decreed by the National Assembly, and be loyal to the nation, to the law, and the to the king. However, Latreille never took the oath and was therefore arrested and imprisoned at Bordeaux under threat of execution.

Necrobia ruficollis Seen Crawling on Pierre André Latreille's Cell Floor, Courtesy of Wikipedia
Necrobia ruficollis seen Crawling on Pierre André Latreille’s cell floor. Courtesy of Wikipedia.

One day while imprisoned, Latreille began watching a beetle crawling on his cell floor.  When the prison’s doctor stopped by for his inspection, Latreille explained to the doctor the rarity and importance of the beetle. The beetle had already been described by Johan Christian Fabricius in 1775. It was a Necrobia ruficollis, a predatory beetle in the family Cleridae. It was also known as the ham beetle, red-shouldered beetle, or red-necked bacon beetle.

The prison doctor was so impressed by Latreille’s knowledge, he sent the beetle to a 15-year-old local naturalist named Jean Baptiste Bory de Saint-Vincent. Bory de St.-Vincent was already well aware of Latreille’s remarkable work and because of Bory de St.-Vincent’s efforts, Latreille and one of his cellmates were released. This was fortunate because a month later Latreille’s other cellmates were executed.

After his release, Latreille gave up the priesthood and taught entomology. He also corresponded with a variety of entomologists and was  encouraged to publish at his own expense, Précis des caractères génériques des insectes. However, Latreille troubles were not necessarily over. He was arrested as an émigré and placed on house arrest in 1797 but with the support of naturalists Georges Cuvier, Bernard Germain de Lacépède, and Jean-Baptiste Lamarck (all who held positions at the Muséum national d’Histoire naturelle), he was released.

Jean-Baptiste Lamarck, Courtesy of Wikipedia
Jean-Baptiste Lamarck. Courtesy of Wikipedia.

In 1814, Latreille succeeded Guillaume-Antoine Olivier as titular member of the Académie des sciences de l’Institut de France, and, over the next few years, Latreille proved to be particularly productive. Among his activities was aiding Cuvier with his volume on arthropods called Le Règne Animal and the production of hundreds of entries in the Nouveau Dictionnaire d’Histoire Naturelle. Latreille was also the first person to attempt to classify arthropods, and he added greatly to the number of known genera and then grouped the genera into families. 

When Lamarck became blind, Latreille took on an increasing proportion of his teaching and research work and then succeeded Lamarck as professor of entomology in 1829. Unfortunately, Latreille’s health had begun to decline before he succeeded Lamarck, and, so, as his health worsened he gave more and more of his activities to another naturalist. Latreille had also married and his wife died in 1830. Thus, on 10 April 1832, because of his ongoing health problems and the loss of his wife, he resigned his teaching position.

Latreille died of bladder disease on 6 February 1833 in Paris, but he was not forgotten. As a testament to his greatest, between 1798 and 1850, 163 species were named in his honor and many books were also dedicated to him. Even Cuvier, whose work is considered the foundation of vertebrate paleontology, thought highly of Latreille and once “said of him that he had studied insects more profoundly than any man in Europe.” 


  • American Journal of Science, Volume 25, 1834
  • “Observations sur divers coléoptères de la Collection de M Dupont Pierre André Latreille,” in Bibliothèque Numérique du Limousin
  • “Pierre André Latreille (1762-1833): the foremost entomologist of his time, in Annual Review of Entomology, 1974
  • Zoological Magazine: Or Journal of Natural History, 1833

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