Resources relating to VN's interest in butterflies and moths:
The main collection of Nabokov's writings on butterflies is Brian Boyd and Robert Michael Pyle, eds., Nabokov's Butterflies: Uncollected and Unpublished Writings (Boston: Beacon Press, 1999; London: Allen Lane/Penguin, 2001, paperback Penguin 2000), 782pp.
The main reference work is Dieter E. Zimmer, Guide to Nabokov's Butterflies and Moths, updated to 2015, contains
- a comprehensive list of species and other taxa named by or for Nabokov
- a comprehensive list of species and other taxa mentioned in Nabokov's writings
- a page-by-page index of references to Lepidoptera mentioned in Nabokov's books and short works, listed chronologically
- a biographical list of scientists mentioned by or known to Nabokov
- a bibliography with summaries of Nabokov's scientific writings
- and much more, such as an overview of taxonomy and Nabokov's relation to it, advice to translators, images of some of the butterflies in art mentioned by Nabokov.
The main collection of Nabokov's butterfly inscriptions is Sarah Funke and Glenn Horowtiz, Véra's Butterflies (New York: Glenn Horowitz, 1999), which contains essays by Brian Boyd and Kurt Johnson, Stephen Jay Gould, and others.
The main collection of Nabokov's butterfly illustrations, mostly scientific, but also including playful butterfly inscriptions, is Stephen H. Blackwell and Kurt Johnson, eds., Fine Lines: Nabokov's Scientific Art (New Haven: Yale University Press, 2016), which includes essays by Nabokov scholars like Blackwell and Boyd and by scientists like Johnson and Robert Dirig.
The main book on Nabokov's scientific impact up to 1999 is Kurt Johnson and Steven L. Coates, Nabokov's Blues: The Scientific Odyssey of a Literary Genius (Cambridge, Mass.: Zoland, 1999).
See also Archives for the main collections of Nabokov's butterfly catches: the American Museum of Comparative Zoology, Cornell University Lepidoptera Collection, Harvard's Museum of Comparative Zoology, and the Lausanne Musée Cantonal. The Nabokov material there is not on display or easy of access, but if you have a serious research interest, these are the places to approach.