Figure 20 from: Tan J-L, Carpenter JM, van Achterberg C (2018) An illustrated key to the genera of Eumeninae from China, with a checklist of species (Hymenoptera, Vespidae). ZooKeys 740: 109-149. https://doi.org/10.3897/zookeys.740.22654

Figure 20 Maxillary palpus (a, a' and aa), labial palpus of female (b, bb) and mandibles of male (c, cc, cc'). a–c Pterocheilus p. phaleratus (Panzer) a' Pterocheilus c. chobauti Dusmet; aa–bb Onychopterocheilus mochii Giordani Soika cc Onychopterocheilus pallasii (Klug) cc' Onychopterocheilus sp.