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I report for the first time the parasitization of overwintering gynes of Parapolybia species by the entomogenous nematode Sphaerularia sp. (Tylenchidae). The nematode was found in 42% of the overwintering wasp clusters examined but occurred in only 6% of individual wasps. The prevalence of parasitic nematodes among group hibernating hymenoptera is briefly discussed and compared with that in solitary hibernating hymenopterans

The prevalence of the parasitic nematode Sphaerularia sp. in the overwintering gynes of Parapolybia spp. (Hymenoptera, Polistinae)