During the winter and early spring months of 193 3-34, the writer collected a large number of wood-boring insects by cutting them from their pupal cells as recommended by Mr. Burke ( 1 ) .On various occasions larval material was discovered and this was taken home and given time to mature.At first the specimens were dis¬ carded if they did not emerge by early summer.Careful observation proved that not all had reached full development at the end of the first or even the second season, and so were set aside for a longer time.By 1940, the writer had come to wonder just how long some of the species would remain in the host plant before reaching maturity.Hence records were kept as the speimens emerged.
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Frank M. Beer (1949) studied this question.