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The Oriental and eastern Palaearctic planthopper genus    Orthopagus    Uhler, 1897 (  Hemiptera  ,   Fulgoromorpha  ,   Dictyopharidae  ,   Dictyopharinae  ,   Orthopagini  ) is revised. Six species are included:    O.   bartletti    Song, Malenovský &amp; Deckert,  sp. n.  (described from India),    O.   exoletus    (Melichar, 1903),  comb. n. ,  stat. rev.  (material studied from India and Sri Lanka),    O.   hainanensis    Song, Chen &amp; Liang,  sp. n.  (described from China: Hainan island),    O.   lunulifer    Uhler, 1897 (the type species of the genus; confirmed from Japan, China, Vietnam, Laos, India, and Nepal),    O.   philippinus    Melichar, 1914 (Philippines), and    O.   splendens    (Germar, 1830) (confirmed from China, Vietnam, Thailand, India, Malaysia, and Indonesia).    Orthopagus   helios    Melichar, 1912 is newly synonymized with    O.   lunulifer   . Lectotypes are designated for    O.   helios   ,   O.   helios   var.   diffusus   Melichar, 1912,    O.   elegans    Melichar, 1912, and    O.   philippinus   .    Dictyophara   indiana    Walker, 1851 is considered a nomen dubium. All species are redescribed, including habitus photographs and detailed illustrations of the male genitalia. Female genitalia are described for the genus for the first time. A key for identification of the species of    Orthopagus    and a distribution map are given.

zoosystematics and evolution

Taxonomic review of the planthopper genus    Orthopagus    (  Hemiptera  ,   Fulgoromorpha  ,   Dictyopharidae  ), with descriptions of two new species