Review of the genus Xanthephialtes Cameron (Hymenoptera, Ichneumonidae), with re-definition of the genus and description of a new species from Uganda

<i>Xanthephialtes</i> Cameron, 1906 (Hymenoptera, Ichneumonidae, Pimplinae) is a small Afrotropical Darwin wasp genus with only two previously known species, for which we provide images of the holotypes. Here, we describe a new species of the genus, <i>X. iida</i> <b>sp. nov.</b>, which is also the first record of the genus in Uganda. We provide a re-definition of the genus and a key to species along with notes on the morphological variation and mimicry of <i>X. schoutedeni</i> Benoit, 1954. Online Lucid identification keys and images of all the species treated herein are available at http://www.waspweb.org.