Two new species of Aglyptinus Cockerell with unusual sexually dimorphic antennae and diffraction gratings (Coleoptera: Leiodidae)

Two Central American species of the genus Aglyptinus Cockerell, A. tumerus and A. phymaphorus, are described as new species. They are notable for unusual asymmetrical expansion of stem antermomeres and presence of conspicuous spectral iridescence on the elytra of males. Probable utility of this unusual sexual dimorphism is discussed.