Chemical analyses also showed the lycids to contain pyrazines, such as were already known from other Lycidae, potent odorants that could serve in an aposematic capacity to forestall predatory attacks.īeetles of the family Lycidae, throughout their tropical and subtropical range, share many of the attributes one associates with distastefulness in insects. However, judging from analytical data, the beetles practice no such sequestration, explaining why they remain relatively palatable (in tests with wolf spiders) even after having fed on lycids.
We postulated that by doing so Elytroleptus might incorporate the lycidic acid from their prey for their own defense. Among their mimics are species of the cerambycid beetle genus Elytroleptus, remarkable because they prey upon the model lycids.
Species of Lycus commonly figure as models of mimetic associations. This compound, a novel acetylenic acid that we named lycidic acid, proved actively deterrent in feeding tests with wolf spiders and coccinellid beetles. We present evidence that North American species of the lycid genera Calopteron and Lycus are rejected by thrushes, wolf spiders, and orb-weaving spiders, and that they contain a systemic compound that could account, at least in part, for this unacceptability. Beetles of the family Lycidae have long been known to be chemically protected.