The London Evening Standard almost certainly carried the same letter that appeared in many newspapers, most prominently in The Times, 5 September 1881, p. 10, titled ‘Mr. Darwin on mosquitoes’ (see letter to Stephen Price, 1 September [1881]). Haydon’s son Walton Haydon was a surgeon with the Hudson’s Bay Company, at Moose Factory, Ontario, Canada; in 1881, he also made a collection of natural history specimens from the area, which was acquired by the United States National Museum (see Preble 1902, p. 27).