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Edward Wesley Janson (14 March 1822 - 14 September 1891) was an English entomologist who specialised in Coleoptera.

Biography
The Janson family was of Dutch origin and Edward Wesley Janson's father was the London Agent of the Dutch-Rhenish Railway Company.

A keen entomologist, Janson was elected a Fellow of the Entomological Society of London in 1843. In 1850 he was appointed Curator of the Society's collections, serving until 1963. He then held the position of Librarian for the Society from 1863 to 1874.

He began his natural history business in 1852 selling books and specimens. He later became a publisher, first intitiating the Journal of Entomology ( in 14 parts from 1862-1866 with Taylor and Francis), then Cistula Entomologica, ( 29 parts, from 1869–1885). He also published a volume of British Beetles in 1863 with illustrations from Curtis's), Curtis's British Entomology.

Janson also assembled a collection of world Elateridae "''It consists of 25,000 specimens of which at least 1000 are original types. Janson purchased the collection of this family made by M. Candeze, and which was the basis of his monograph. He also bought a second collection formed by Candeze, and he possessed according to a note found anmongst his papers the collections of" Pierre André Latreille, Pierre François Marie Auguste Dejean, Jean Baptiste Lucien Buquet, Reiche, Laferte, Gory, Parry, Deyrolle, Schaum (part), Bakewell (including Curtis), W.W. Saunders, Mniszech, E. Brown, A. Murray, H. Clark, and Atkinson. He also had large series of specimens collected by Wallace, Bates, Buckley etc. ''"

Legacy
At the time of his death, Janson was seen by peers as a man "possessing skill and judgement as an entomologist," and preferring to "devote his talents to the assistance of others" than to publish.

Edward Janson's son, Oliver Erichson Janson (1850 - 25 November 1925) followed his father's career path, taking over the family natural history and publishing business.

The Janson company archive is conserved in the Natural History Museum, London