A new species of Megarhyssa Ashmead (Hymenoptera: Ichneumonidae: Rhyssinae) from tropical Mexico with a key to Mexican species Author Khalaim, A. I. Author Ruíz-Cancino, E. text Zootaxa 2013 3619 2 195 200 journal article 10.11646/zootaxa.3619.2.7 78c60756-c07c-4122-b1ec-da97f10369ce 1175-5326 218640 5CF3C08B-F190-4B4F-B38C-3360353BA936 Megarhyssa Ashmead, 1900 Thalessa Holmgren, 1859 : 122 . Preoccupied by Thalessa Adams, 1853 (Mollusca) . Type species: Ichneumon clauatus Fabricius, 1798 (= perlatus Christ, 1791 ), by subsequent designation ( Ashmead 1900 ). Megarhyssa Ashmead, 1900 : 368 . Replacement name for Thalessa Holmgren. Megalorhyssa Schulz, 1906 : 115 . Unjustified emendation for Megarhyssa . Eurhyssa Derksen, 1941 : 721. Type species: Ichneumon superbus Schrank, 1781 , by subsequent designation ( Townes & Townes 1951 ).