The genus Dedalopterus Sabatinelli & Pontuale, 1998 (Scarabaeidae: Melolonthinae: Leucopholini) in Laos and Vietnam, with description of a new species Author Pham, Phu Van Institute of Ecology and Biological resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam. & Museum A. Koenig, Leibniz Institute for the Analysis of Biodiversity Change (LIB), Adenauerallee 127, 53113 Bonn; Germany. Author Ahrens, Dirk Museum A. Koenig, Leibniz Institute for the Analysis of Biodiversity Change (LIB), Adenauerallee 127, 53113 Bonn; Germany. Author Sabatinelli, Guido Muséum d’histoire naturelle, C. P. 6434, CH- 1211 Genève 6, Switzerland. text Zootaxa 2024 2024-02-02 5406 1 141 152 http://dx.doi.org/10.11646/zootaxa.5406.1.7 journal article 10.11646/zootaxa.5406.1.7 1175-5326 10611467 4CB53437-B2F9-4C82-AEA9-E2E18B13A6AF Key to the species of Dedalopterus (males only) Based on the key of Sabatinelli & Pontuale (1998) , modified and updated 1 Antennal club less than twice as long as remaining antennomeres................................................ 2 - Antennal club twice or more than twice as long as remaining antennomeres....................................... 6 2 Parameres of unequal length............................................................................ 3 - Parameres of equal length.............................................................................. 4 3 Protibia bidentate, tegument of elytra light-brown to yellow, parameres short............... D. fujianensis ( Zhang, 1990 ) - Protibia tridentate (basal tooth small), tegument of elytra dark brown, parameres longer.................................................................................................... D. itohi Sabatinelli & Pontuale, 1998 4 Parameres curved ventrally by 40 o at distal third (lateral view).......................... D. fencli Zídek & Krajčík, 2007 - Parameres entirely straight (lateral view)................................................................... 5 5 Right paramere rather straight and larger.......................................... D. melanodiscus ( Zhang, 1990 ) - Right paramere curved moderately dorsally at apex and slender.......................... D. hainanensis ( Zhang, 2002 ) 6 Pygidium apically rounded.............................................................................. 7 - Pygidium apically triangular............................................................................. 8 7 Parameres rather straight and long, right paramere width almost equal to the left one (see Fig. 3 ; Sabatinelli & Pontuale, 1998 ).......................................................................... D. signatus ( Moser, 1908 ) - Parameres rather curved and short, right paramere narrower than left one (see Fig. 2 , Sabatinelli & Pontuale, 1998 ).................................................................................... D. intermedius ( Zhang, 1990 ) 8 Frontal depression deep; apical segment of maxillary palp with a large callus on its outer surface...................... 9 - Frontal depression superficial, apical segment of maxillary palp with a minor callus on its outer surface................................................................................................. D. malyszi Bunalski, 2001 9 Parameres unequal in length, right paramere shorter and slender than the left one............................................................................................ D. lexuanhuei Pham, Ahrens& Sabatinelli , new species - Parameres equal in length............................................. D. pulchellus Sabatinelli & Pontuale, 1998