At the end of his almost finished poem John Shade (the poet in VN's novel Pale Fire, 1962) mentions a Vanessa butterfly:
A dark Vanessa with crimson band
Wheels in the low sun, settles on the sand
And shows its ink-blue wingtips flecked with white.
And through the flowing shade and ebbing light
A man, unheedful of the butterfly -
Some neighbor's gardener, I guess - goes by
Trundling an empty barrow up the lane. (ll. 993-999)