昆虫的一生,外部形态与内部器官经历几次大的变化,叫变态。大多数昆虫如蝶、蛾、蚊、蝇、蜂、甲虫都经过卵、幼虫、蛹、成虫四个时期,叫做完全变态。还有一种是不完全变态,例如蝗虫、蝼蛄、叶蝉、木虱、粉虱、蚜虫、蚧壳虫、椿象,一生中只有卵、幼虫、成虫三个时期,没有蛹期,幼虫与成虫基本相似,只是体形较小,翅未长成 Insect life, external shape and internal organs undergo several major changes, called metamorphosis. Most insects such as butterflies, moths, mosquitoes, flies, bees, beetles have gone through four stages of eggs, larvae, pupae and adults and are called perverted. There is also an incomplete metamorphosis, such as locusts, emus, leafhoppers, psylla, whitefly, aphids, scale insects, stinkbugs, only eggs, larvae and adults in their three stages, there is no pupal stage, larvae and adults basic Similar, but smaller, wings did not grow into