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).
上颚消失，上
退化为
条窄横片，
退化为小片（
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).
上颚消失，上退化为条窄横片，退化为小片（发达）。
The experiment is such: Researcher uses foam rubber or plastic from the female alar collect secretion, dissolve is in at the inunction after alcohol the labrum of a few females.
研究人员用海绵从
性腋收集分泌物，溶于酒精后涂擦在
性的上。
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