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Psaltoda plaga
''Psaltoda plaga'' is a species of cicada native to eastern Australia, from Maryborough in central Queensland to Bega in southern New South Wales. Adult cicadas appear over the summer and inhabit forested areas near bodies of water. The predominantly black form from the Sydney and Central Coast regions is commonly known as the black prince, while the term silver knight is used for the species as a whole.
==Taxonomy==
The black prince was originally described by German naturalist Ernst Friedrich Germar in 1834 as ''Cicada argentata'', the species name derived from the Latin ''argentum'' "silver". Swedish entomologist Carl Stål defined the new genus ''Psaltoda'' in 1861 with three species, including the black prince as ''Psaltoda argentata''. Meanwhile, Francis Walker described ''Cicada plaga'' in 1850 as well as querying further specimens as ''Cicada argentata''. He noted in 1858 that the binomial ''Cicada argentata'' had been used by a European species, and declared that Germar's cicada needed a new name. The older combination was ruled invalid as the binomial ''Cicada argentata'' had been originally used for a European cicada now known as ''Cicadetta argentata'', and the black prince became ''Psaltoda plaga''.
''Psaltoda mossi'' is similar to ''P. plaga'' in colour and brown discoloration on the wing, but has its prominent postclypeus and large abdominal tergite 3 suggest a closer relationship with ''P. flavescens''.〔 ''Psaltoda harrisii'' is also similar, but is smaller and lacks the wing infuscation. Relationships of the members of the genus ''Psaltoda'' remain unclear pending a full phylogenetic investigation.
The name ''black prince'' was in popular use by 1923. It was reported by McKeown in 1942 as referring to a dark form of the green grocer (''Cyclochila australasiae'' forma ''spreta''), but was later linked to ''Psaltoda plaga''.〔Moulds, p. 3.〕 It is used for the darker form of the species, while the name ''silver knight'' is used for the olive and green colour forms.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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