The number, external morphology, and distribution of antennal sensilla of Zamagiria dixolopella Dyar were determined by light and scanning electron microscopy. The antennal flagellum of both sexes has six types of sensilla: trichodea (subtypes I and II), chaetica, coeloconica, styloconica, auricillica, and squamiformia. There is sexual dimorphism in the antennae of Z. dixolophella. The male antenna has a tuft of hairs or modified scales at its base and one protuberance for each segment in the first seven segments, below the tuft of hairs or modified scales. These structures are not present in the female antenna. We believe that these structures have not been reported previously in Pyralidae. Sexual dimorphism was also observed in the subtypes of sensilla trichoidea. One subtype of long sensilla trichoidea (subtype I) occurs only on male antennae, whereas the other subtype of short sensilla trichoidea (subtype II) occurs mainly on female antennae.
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Vol. 96 • No. 5