Eocene Orthoptera from Green River Formation of Wyoming (USA)

Abstract

A review of fossil Orthoptera from Green River Formation of Wyoming (Middle Eocene) is given. Pterotriamescaptor? americanus sp.n., Eomog- oplistes longipennis gen. et sp.n., Pteromogoplistes gran- dis gen. et sp.n., Eogryllus unicolor gen. et sp.n., E.? elongatus sp.n., Eozacla arachnomorpha gen. et sp.n., E. problematica sp.n., Eotrella mira gen. et sp.n., Tet- toraptor maculatus gen. et sp.n., Eotettix unicornis gen. et sp.n., and Eoerianthus eocaenicus gen. et sp.n. are described. Two species, Pteromogoplistes smithii (Scud- der, 1890), comb.n. and Pronemobius tertiarius (Scud- der, 1878) are restudied on the base of new material possibly belonging to these species; systematic position of them and of Eoerianthus? multispinosus (Scudder, 1890), comb.n. is clarified. Some general remarks on the Orthoptera fauna of Green River Formation are made.