Abstract
The apparent site of aggregation pheromone production in the sap beetle Carpophilus freemani Dobson is described. Small (≈100 μm diameter) disks associated with the tracheal system in the abdomen contain the pheromone in this insect. These structures appeared to be single cells with large nuclei. Similar structures were found in Carpophilus hemipterus (L.), C. lugubris Murray, C. antiquus Melsheimer, C. (Urophorus) humeralis (F.), Stelidota geminata Say, Haptoncus luteolus (Erichson), and Glischrochilus quadrisignatus (Say), suggesting that these structures are a common source of pheromones in sap beetles.
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