The wasps are European paper wasps, Polistes dominulus, an invasive species that has come to dominate our native Polistes....The nest is also a paper wasp nest, but it looks old, certainly could not have reached those proportions in such a short time....I understand that no paper nests are ever re-used, so I don't know what these two are doing on that nest. Further, the European paper wasp nests in sheltered situations, especially cavities, never in the open like this.