Which of these is not a character in Roald Dahl's 'James and the Giant Peach'?

James and the Giant Peach is a popular children's novel written in 1961 by British author Roald Dahl. The original first edition published by Alfred Knopf featured illustrations by Nancy Ekholm Burkert. There have been reillustrated versions of it over the years, done by Michael Simeon for the first British edition, Emma Chichester Clark, Lane Smith and Quentin Blake. It was adapted into a film of the same name in 1996.

Three of the characters are:

The Earthworm – A male earthworm who often quarrels with the Centipede, and is frequently the most pessimistic of the protagonists, though on amicable terms with nearly all. In New York City, he becomes the mascot of a skin-cream company.

The Ladybird – A kind, motherly female ladybird who takes care of James. In the last chapter of the book, it is revealed that the Ladybird "married the head of the New York City Fire Department and lived happily ever after".

The Silkworm – A female Silkworm, who assists Miss Spider in the production of thread, both before and after the adventure. She is never seen to speak and is also the only one of James' travelling companions not to appear in the film adaptation.

There is no character called 'The Butterfly'.