Thanks HWB for references.
Praises his paper ["Contributions to an insect fauna of the Amazon valley", read before Linnean Society, 21 Nov 1861, Trans. Linn. Soc. Lond. 23 (1862) : 495–566] which solves "one of the most perplexing problems which could be given to solve".
Discusses the difficulties of writing and expresses disappointment at Wallace’s book [Travels on the Amazon (1861)].