Abstract
A study of male genitalia, morphometric head measurements and DNA barcoding revealed three overlooked species in eastern Nearctic Polistes (Fuscopolistes), two of which are described here: P. (F.) hirsuticornis Buck, sp. nov. and P. (F.) parametricus Buck, sp. nov. Polistes carolina of authors is a complex of two or three species. Type studies also uncovered new synonymies: P. rubiginosus Lepeletier, 1836, sp. restit. (=P. perplexus Cresson, 1872, syn. nov.; P. generosus Cresson, 1872, syn. nov.); P. nigripennis (De Geer, 1773) is removed from synonymy with P. carolina (Linnaeus, 1767) and tentatively synonymized with P. canadensis (Linnaeus, 1758) (=Vespa nigripennis De Geer, 1773, syn. nov.). A revised key to eastern Nearctic Fuscopolistes Richards, 1973 is presented. The male genitalia of eastern Nearctic species are illustrated in detail for the first time, and a preliminary genitalic key is presented. DNA barcoding revealed strongly divergent genetic lineages in three species besides "P. carolina". A so-called 'barcoding gap' was not detected, thereby ruling out species delimitation through divergence thresholds. Indirect evidence suggests that the newly described species may be obligate social parasites.
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