A Simple Statistical Method for Determining the Approximate Duration of the Instars of Leaf-mining Larvae and Others

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Abstract
It is usually laborious and difficult to determine satisfactorily the duration of the larval instars of those forms which molt in leaf-mines, bear cases, or are otherwise not readily measured without removal from shelter. A simple statistical method, which has several advantages, is described. Comparative data on Phyllotoma nemorata (Fallén) and Coleophora salmani Hein are given as examples.