Extend Mandibles◆ The giant dragonfly nymph extends its jaws to a surprising distance. The dragonfly nymph makes a mandibles Strike with a reach of 10 feet, but the mandibles lose the agile trait for this Strike.
Source: Pathfinder Monster Core 2
Running this fight? Add the giant dragonfly nymph to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.