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，唇退化为一条
，下唇退化为一小（下唇须发达）。
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，唇退化为一条，下唇退化为一小（下唇须发达）。
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