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Two new species,    Pteromalus   briani    sp. n.  and    P.   janstai    sp. n. , with unusual characters are described from the Central Plateau and the Alps in Switzerland, respectively.    P.   briani    sp. n.  is remarkable in that it has the metatibia quite abruptly expanded before the middle. This type of modification of the hind tibia is unique within the   Pteromalidae   and probably also the entire   Chalcidoidea  . It is also very rare in other parasitic wasps, where it is suspected to be associated with pheromone glands. The species is a gregarious endoparasitoid of pupae of    Vanessa   atalanta    (Linnaeus) and    Aglais   urticae    (Linnaeus), two common butterflies (  Lepidoptera  :   Nymphalidae  ) in Europe. It is furthermore a koinobiont parasitoid ovipositing in an early larval stage of the host. The other species,    P.   janstai    sp. n. , shows a flattened mesosoma. A dorsoventrally depressed body is a unique feature within the genus    Pteromalus   , but known from a number species in unrelated genera and subfamilies. The two records demonstrate that it is possible to discover entirely new species with extraordinary characters even in one of the taxonomically most thoroughly explored parts of the world.

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Pushing the limits – two new species of    Pteromalus    (  Hymenoptera  ,   Chalcidoidea  ,   Pteromalidae  ) from Central Europe with remarkable morphology