Appearance
With respect to structures, the antennae and the gaster; this being the enlarged, bulbous part of the posterior of the hymenopteran body are slightly different between the two sexes. That is, these structures of the males possess one more segment than the females. Other differences are observed in relation to the coloration of certain parts of this wasp.References:
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https://sta.uwi.edu/fst/lifesciences/documents/Polistes_lanio.pdf