labrum

1.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.

实验是这样的：研究人员用海绵从女性腋收集分泌物，溶于酒精后涂些女性的上。

2.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，上退化为条窄横，退化为小（须发达）。