- Natural History Museum, London: NHM WP1/3/47
- Marchant, J. (Ed.). (1916). In: Alfred Russel Wallace; Letters and Reminiscences. Vol. 1. London & New York: Cassell & Co. [p. 72]
Bates' safe arrival (in England); hopes Bates will write a Fauna of the Amazon Valley; ARW's own plans for a similar work on the Malay Archipelago; hopes for exchange of duplicate specimens; paper on principles of Geographical distribution in the archipelago sent to the Linnean Society.