what did Dill explain as the reason why he ran away?

That night Scout feels something under her bed and thinks a snake his hiding there. She gets Jem to investigate, and they discover Dill hiding under Scout's bed. Dill tells a long story about being locked and chained in a basement and escaping with a traveling animal show. Then, he tells the real story of how he stole money from his mother's purse, and walked and hitched his way from the train station to the Finch house.