Published a report on the Coleoptera of the Marlborough District in Report Marlborough College Nat. Hist. Soc., 1896, pp.55-74. Lists species added since a previous publication in 1874. (MD 8/03)

Specimens collected by Jarvis in the New Forest and at Croydon are in the Hall Collection at Oldham (Information from Simon Hayhow). (MD 8/03)

A Reverend. Mentioned by Dawson (1854) p.159, in connection with Stenolophus dorsalis 'The Rev. Mr Jarman captured it abundantly in May 1853 near the railway bridge that crosses the lode in Holme Fen, Hunts.' (MD 8/03)

His own insect collections were destroyed by enemy action in 1944 but K.C.Lewis tells me that he has Janson beetles in his collection.

A Lepidopterist rather than a Coleopterist but he had a wide range of knowledge about insects and worked in the family business in Great Russell Street until about 1911 when he set up on his own account until his retirement in the 1940s. For many years he catalogued the insect lots in Stevens’s sale rooms in King Street, Covent Garden. His own insect collections were destroyed by enemy action in 1944 but K.Lewis tells me has specimens in his collection. FRES from 1898. Member SLENHS 1928/29 – 1953/54 (Council 1931-33; Hon Recorder 1929/30-51/52). (MD 8/03)

Son of Edward Wesley Janson (see above) and shared his passion for the Coleoptera, taking over the family business and involving himself in collecting, research and publication. Janson's early youth was spent at Fortis Green, Middlesex, in the area of which he collected extensively particularly at Finchley, Hampstead and Highgate. In 1906 he travelled to Iceland as a result of which he presented a collection of beetles to the Museum at Reikjavik whose holdings of Coleoptera were thin.

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.

His family was of Dutch descent and his father was for many years London Agent of the Dutch-Rhenish Railway Company. In was in his father's office that Janson is recorded to have learned his business skills. Janson's interest in entomology was sufficiently developed by 1843 that he joined the Entomological Society, and his first publication was 'Notice of the occurrence of rare Coleopterous insects with observations on their habits' in Zool., 6, 1848, 2108-2110.

Published with L.H.B.Wyse 'A Fortnight's Entomology in C. Waterford' which mentions Coleoptera, IN., 32, 1928, pp.9-17. Mentioned by Johnson and Halbert (1902) p.542. (MD 8/03)

Published two notes on Irish Coleoptera: 'Timarcha tenebricosa in Co. Waterford', IN., 2, 1893, p.199; and 'Coleoptera from Armagh', (includes Cionus thapsus and Quedius cruentis as new to Ireland), ibid., p.51. (MD 8/03)