节肢动物是无脊椎动物中最高等的一个类群。其中种类最多、与人类关系最密切的是昆虫纲。昆虫纲一节的重点是讲述蝗虫的形态、构造、生理及发育,从而总结出纲的特征。同时讲述昆虫的多样性。有关昆虫纲分目的知识,对于有益昆虫的饲养及有害昆虫的防治都十分有用。关于蝗虫外形及发育,近几年初中生物课本(《生物》全一册)都进行了讲述,各地也组织过老师进修学习,这里不再赘述。但对昆虫分目的知识却已有十多年不讲了,不少生物老师 Arthropods are the highest class of invertebrates. Among them, the largest species and the most closely related to humans are insects. The section of the Insecta focuses on the morphology, structure, physiology and development of the locusts and thus summarizes the features of the order. At the same time about the diversity of insects. Knowledge about the order of the Insecta is useful for keeping beneficial insects and for controlling harmful insects. About locust shape and development, in recent years, junior high school biology textbook (“biology” all one book) are described, all over the country also organized teacher learning, not repeat them here. However, the purpose of insect sub-division has not talked about more than a decade, many biological teachers