Mischocyttarus (cephalothorax of female) 1 Cephalothorax almost entirely pale, light reddishbrown........................................................................ 2 – Anterior third of cephalothorax pale, posterior two thirds dark; dark colouration of prosternum reaches border between head and cephalothorax ventrally (Fig. 1C); maxilla short, wider than long (mx, Fig. 2A); hosts: Mischocyttarus navajo Bequaert, M. flavitarsis (Saussure), and M. pallidipectus (Smith)....................................... Xenos bicolor Benda & Straka sp. nov. 2 Cephalothorax very small (length 0.80–0.86 mm, width 0.86–0.96 mm), head capsule elongate, almost half as long as cephalothorax (Fig. 5B); host: Mischocyttarus costaricensis Richards..................................................... Xenos pallens Benda & Straka sp. nov. – Cephalothorax large (length 1.43 mm, width 1.8 mm), head capsule shorter, about one third as long as cephalothorax (Fig. 5C); host: Mischocyttarus flavicans (Fabricius).................... Xenos americanus Brèthes, 1923.

Published as part of Benda, Daniel, Pohl, Hans, Beutel, Rolf & Straka, Jakub, 2022, Two new species of Xenos (Strepsiptera: Xenidae), parasites of social wasps of the genus Mischocyttarus (Hymenoptera: Vespidae) in the New World, pp. 185-195 in Acta Entomologica Musei Nationalis Pragae 62 (1) on page 193, DOI: 10.37520/aemnp.2022.014, http://zenodo.org/record/7300472