Several month ago, a friend and I were examining types of a certain family of Diptera in a university museum. Each type series was pinned to the right hand side of a label which bore the name of the species, while each pinned specimen carried a red label reading merely "holotype," "allotype," or "paratype." My friend removed one of the paratypes from the end of its row, examined it with his hand lens, and pinned it back into the tray, failing, however, to notice that he had placed it in the wrong row, thereby erroneously indicating it to be a paratype of quite another species. Fortunately this accident was immediately discovered and corrected. But how often do similar accidents occur, involving perhaps less important specimens, because of the lack of an identification label on each pinned insect specimen?
Byers, George W., "Individual Identification Labels for Pinned Insect Specimens" (1958). Bu. Paper 76.
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