Please read Alexey Sklyarenko's annotations on Pale Fire, Ada and other Nabokov works here.
In his poem “The Nature of Electricity” quoted by Kinbote (in VN’s novel Pale Fire, 1962, Shade’s mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) in his Commentary Shade mentions Shelley’s incandescent soul that lures the pale moths of starless nights: