蝉，又名知了，是一种擅叫的昆虫。《辞源·蝉》中说：“于夏秋间出现，雄蝉翅后有发声器，幼虫居土中，自化蛹至成虫，为期约二年。既为成虫，交尾后即死；雌者产卵后亦死，生命不过两三周。”它体态隽秀，吟声悠扬，是我们儿时的朋友。 蝉的种类颇多。据我所见，至少有两三种 Cicada, aka known, is a good insect. “Cicada,” said: “In the summer and autumn, there are sirens after the male cicada wings, larvae in the soil, from pupation to adults, for about two years .As adults, after mating dead; female spawning After death, but life two or three weeks. ”It is handsome body, melodious soprano, is our childhood friend. Many types of cicadas. As far as I can see, there are at least two or three kinds