The mandibles are usually lost, the labrum is reduced to a narrow transverse sclerite, and the labium is a small flap ( though its palps retain quite large).
颚消失,
退化为一条窄横片,
退化为一小片(

发达)。
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尔曼松·凡·莱因 The little princess talked incessantly, her short, downy upper lip continually and rapidly touching her rosy nether lip when necessary and drawing up again next moment when her face broke into a smile of glittering teeth and sparkling eyes.
小公爵夫人不停地说着话,她的嘴时而闭一下,那带着毫毛的短上唇稍稍触到鲜红的下唇,接着嘴又张开,绽开闪耀着牙齿和目光的笑容。