I am assuming here that you are talking about the western fence lizard? they eat insects and arthropods (spiders, ants) I would stick with meal worms and crickets that are pet store bought unless you are feeding a wild specimin
Asked in Insects
What are bugs that have White belly blue back with black markings?
There are several types of caterpillar that match this description. They can have a white belly with a blue back and black markings. ...