The Lizard War by Jack Patton
LET THE INSECT BATTLES BEGIN! A new six-book series full of epic battles and creepy crawlie facts! After finding a strange old encyclopaedia of bugs, eight-year-old Max Darwin finds himself mysteriously shrunken and whisked away to tropical Bug Island. There, he learns that he can he talk to the incredible bugs and insects that populate the island and that they need his help. A rival island populated by reptiles is threatening to take over. Can Max save the day, using his knowledge of all things insect?