In hemicephalous larvae, the head and its appendages are reduced and partially retracted into the thorax.
半头型无足幼虫头
分退化，后端缩入胸，如双翅目的大蚊及一些寄
性
翅目幼虫。
In hemicephalous larvae, the head and its appendages are reduced and partially retracted into the thorax.
半头型无足幼虫头分退化，后端缩入胸，如双翅目的大蚊及一些寄性翅目幼虫。
The mines of Hymenoptera wasps have more and darker frass than the mines of dipetrous flies.
与双翅目相比，翅目蜂类的粪便更多更黑；鞘翅目甲虫类则经常造
叶子的缺刻。
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