Two new species of Szelenyiopria Fabritius (Hymenoptera, Diapriidae), larval koinobiont endoparasitoids of the leaf-cutter ant Acromyrmex coronatus (Fabricius) (Hymenoptera, Formicidae), from Panama

Leaf-cutter ant nests attract a wide variety of guests and parasites due to considerable food resources, substrate and shelter available within nests. Limited information is known about their taxonomy, bionomics, and natural history, including interactions with the ants, and degree of host specificity of these symbionts. Here we describe two new species of <i>Szelenyiopria</i> Fabritius, 1974 (Diapriidae, Diapriinae, Diapriini) wasps which are koinobiont endoparasitoids of the larvae of a leaf-cutter ant, <i>Acromyrmex coronatus</i> (Fabricius, 1804) (Myrmicinae, Attini) in Chiriquí, Panama. For both new <i>Szelenyiopria</i> species, <i>S. fortunensis</i> Araúz & Fernández-Marín, <b>sp. nov.</b> and <i>S. chiriquiensis</i> Araúz & Fernández-Marín, <b>sp. nov.</b>, we provide information on parasite-host interactions. The most abundant and frequent parasitoid type was solitary, while gregarious parasitoidism, where two or more wasps emerged from a single ant larva, was associated with certain times of the year. We provide an updated key to females of all species of <i>Szelenyiopria</i>, their geographic distribution, and host-parasite interactions. <i>Szelenyiopria</i> previously had been identified as parasitoids of several ant genera including some <i>Acromyrmex</i> species, but our data indicate that some species of <i>Szelenyiopria</i> may be specialized on <i>A. coronatus</i> ants. Rates of parasitism suggest that the wasps have a negative effect on colonies and populations of the ants.