Entries on individual members of the family are given below. However, because there are numerous references in collections and the literature which it is often difficult to assign to one member of the family or another, sometimes because they refer to the family business, I have thought it useful to include this general reference. The Janson family became Natural History Agents and Booksellers at 44 Great Russell Street in 1852, and continued this business for more than a hundred years during which time they were purchasers and sellers of numerous specimens and collections from all over the world, and corresponded with many of the most important naturalists of the day. In 1991, after the business had closed, their records were presented to the Natural History Museum, Entomological Library. Harvey et al (1996) pp.110-112, describe the collection as follows: 'The archive consists of a vast amount of material including business papers, letters, letterbooks and account books, c. 1873-1929. It includes the papers of Edward Wesley Janson (1822-1891), Oliver Erichson Janson (1850-1926), Oliver Jordan Janson (1876-1964), O.E.Janson and Son, and Janson and Sons. The correspondence collection contains thousands of letters to and from entomologists and naturalists regarding the purchase and sale of collections, including specimens collected on expeditions and from private collections: [The following list excludes most of the foreigners but includes all British entomologists] Adams, H.J. (1898), Adkin, B.W. (1909-1921), Adkin, Robert (1894-1927), Andrewes H.E. (1899-1926), Angell, J.W. (1910-1920), Armitage, E. (1872-1879), Arrow G.J. (1899-1922), Bagnall, R.S. (1904-1908), Barrett, C.G. (1899-1900), Bates, F. (1872-1903), Bates, H.W. (1872-1879); Bell-Marley, H.W. (1912-1917), Bethune-Baker, G.T. (1901-1928), Black, J.E. (1900-1924), Buckton, G.B. (1898), Burr, M. (1898-1919), Butler, E.A. (1908), Cameron, M. (1913-1927), Carpenter, G.D.H. (1928), Carrington, J.T. (1906), Carter, H.J. (1928-1929), Champion, G.C. (1897-1926), Chitty, A.J. (1900), Christy, W.M. (1898), Cockayne, E.A. (1911), Coe, R.L. (1927), Collin, J.E. (1899-1923), Cooke, B. (1874), Crawford W.M. (1923), Crotch, G.R. (1872-1874), Davidson J. (1922-1925), Day, G.O. (1896-1905), Distant, W.L. (1879-1920), Doherty, W. (1893-1901), Dow, R.P. (1914), Dunning, J.W. (1872-1877), Elwes, H.J. (1893-1894), Embry, B. (1927), Fitch, E.A. (1874-1877), Fowler, W.W. (1877-1911), Froggatt, W.W. (1927), Frohawk, F.W. (1894-1922), Fryer, H.F. (1877-1879), Gimingham, C.T. (1920-1926), Gorham, H.S. (1872-1911), Gosse, P.H. (1879), Gray, J.E. (1872), Hallett, H.M. (1917), Hampson, G.F. (1902-1906), Harrison, A. (1904-1909), HEMMing, A.F. (1919-1929), Hewitson, W.C. (1873-1876), Holland, W.J. (1893-1929), Jeffery, H.G. (1923), Johnson, C.W. (1904-1905), Joy, N.H. (1902-1920), Kirby, W.F. (1879-1905), Lowther, R.C. (1921-1924), Mason, F.R. (1909-1918), May, J.W. (1875), Meyrick E. (1877-1905), Newman, E. (1872-1875), Ormerod, E.A. (1879-1900), Parry, F.J.S. (1873-1875), Pascoe, F.P. (1875), Pickard-Cambridge, A. (1917), Reynolds, L.R. (1917-1918), Roebuck, W.D. (1874-1907), Rye, E.C. (1872-1875), Selous, C.F. (1906-1929), Sheldon, W.G. (1896-1926), Shipp, W.J. (1893-1897), Stainton, H.T. (1872-1874), Stoneham, H.F. (1929), Swinhoe, C. (1893), Theobold, F.V. (1921), Wallace, A.R. (1876-1903) and Wollaston, T.V. (1872-1878)'. Sharon Reid at the Central Science Laboratory (DEFRA), York, informs me that there are specimens labelled simply Janson in the F.Bates collection there (see BATES, F. and WILLIAMS, B.S.) (MD 8/03, 10/03)