We report diurnal behavior in the mimallonid Lacosoma chiridota Grote, 1864. Female pheromone releasing behavior was recorded in the late afternoon in Gainesville, Florida. A single diurnal male was recorded responding to a “calling” female at 1745 h. We discuss the unique case of sexual dimorphism exhibited by L. chiridota, such that most Mimallonidae generally do not display pronounced sexual dimorphism, and suggest that this may be related to the likewise unique diurnal behavior of this species.
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