Locusts are mentioned as part of the wilderness diet of  John the Baptist (Matt 3:4; Mark 1:6).
A locust  蝗蟲 is one kind of grasshopper.
It has a brown-colored body two to three inches long.
　

An evergreen tree growing about 6 to 9 meters (20-30 feet) tall and having small glossy leaves. It bears long pods 豆莢 known as carob 角豆 or locust beans (Luke 15:16).
pod of carob tree 角豆的豆莢 : the long dark-colored edible pod of the carob tree that contains a sweet-tasting pulp.
Some people believe John the Baptist ate the plant (locust beans) locusts, not insect locusts.