Working with Johann Wilhem Meigen [(1764-1845), German entomologist] on 'Diptera' [flies] and updating his 1804 work ["Die Fliegen"], correcting the Fabrician synonymy by comparing against the collections of [Johan Christian] Fabricius. Asks for Smith's assistance by facilitating comparison with Linnaean collections, by either specimens or drawings and descriptions. Proposes [William Elford] Leach as an alternative.
[On separate folio] List of dubious species.