Andrew wrote
> Aren't there some species of insects which cannot eat after they emerge
> from their chrysalis stage? I read this about silkworms, but since it was
> in a historical novel it may just have been a wrong belief at the time.
All species of fireflies in Japan can't eat in the imago stage.
Adult fireflies drink only water not to get nutrients,
but to keep their internal biochemical reaction proper.
Hiroto Kawakami