Abstract
In March 1920 my attention was called by Dr. F. W. Dootson, University Lecturer in Chemistry, to the fact that a beetle was breeding in numbers in a jar of argol in the Chemical Laboratory of Cambridge University. The insect proved on examination to be the introduced Ptinid, Trigonogenius globulum, Solier, a form related to the household insect, Niptus hololeucus, to which it bears at first sight a slight resemblance.

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