幼虫龄期特征的划分是害虫预测预报的基本资料之一。据报导,鼎点金钢钻(Earias cupreovirdis Wik.)幼虫龄期取食蕾铃的极大多数为五龄。但对幼虫各龄期的区分特征很少报导。1979年8月中旬,我们在大丰县金墩公社工作期间,正遇金钢钻发生,在田间调查时,采集了大小不等的幼虫,室内测量其头宽、体长,应用统计分析方法来区分龄期特征。 The division of larval instar characteristics is one of the basic information of pest forecast. It has been reported that a very large majority of larvae of the Earias cupreovirdis Wik. However, seldom reported on the characteristics of larvae at all stages. In mid-August 1979, during the work of Golden Pier Commune in Dafeng County, we encountered golden steel diamonds. During the field investigation, we collected larvae of different sizes and measured the head width and length of the larvae indoors. We applied the statistical analysis method Differentiate age characteristics.