Notes on two unusual species of Symphyta (Hymenoptera: Pergidae, Xiphydriidae) from Chile, with the first report of a gall-inducing sawfly from the Neotropical Region

We report the southernmost record (Huinay Scientific Field Station: 42°22 ́ S, 72°24 ́ W, Comau, chilean Patagonia ) for the sawfly Philoperra obscura Smith (Pergidae) and add new morphological and biological data on this poorly known species. The individuals of P. obscura known so far appear to morphologically differ in the number of antennomeres, forewing anal cell shape, and color of the first abdominal tergum and of the hind tibia. The individual at Huinay was collected from inside a gall on Nothofagus betuloides Mirb. (Oerst.) (Nothofagaceae), thus resulting in the first report of a gall-forming sawfly from the Neotropical Region. An individual of a second sawfly species, Derecyrta beechei Smith (Xiphydriidae), was also collected at Huinay and presented some differences with the previously known individuals in forewing venation and color of the mandibles.