{{short description|Species of moth}} {{italic title}} {{Speciesbox | name = ''Idaea dilutaria'' | image = Silky Wave Moths of the British Isles.jpg | image_caption = | taxon = Idaea dilutaria | authority = (Hübner, 1799) }} '''''Idaea dilutaria''''', also called the '''silky wave''', is a moth of the family Geometridae. It is found in Europe.

thumb| 150px|left|Fig 1,1a Larvae in various stages 1b enlarged details of segments

The species has a wingspan of 20–22&nbsp;mm.Recognizable by its strongly silky gloss, the absence of costal colouration (the costal margin has merely a sparse dusting of dark scales), the unmarked distal margin and fringe.The ground-colour is yellowish-tinted the discal dots are minute and there are no terminal lines.The other lines are generally all of approximately equal expression, sometimes the postmedian a little stronger, sometimes the median of the forewing weak.The underside is similar, the postmedian line often a little stronger, theantemedian and sometimes the median of the forewing obsolete. The males antennal ciliation is short and even.<ref>Prout, L. B. (1912–16). Geometridae. In A. Seitz (ed.) ''The Macrolepidoptera of the World''. The Palaearctic Geometridae, 4. 479 pp. Alfred Kernen, Stuttgart.[https://archive.org/details/macrolepidoptera1216seit pdf] {{PD-notice}}</ref>

The adults fly in one generation in July {{Ref|flight_season}}.

The larvae feed on ''Helianthemum nummularium''.

==Notes== #{{Note|flight_season}}''The flight season refers to the British Isles. This may vary in other parts of the range.''

==References== {{Reflist}}

==External links== {{commons category}} *[https://ukmoths.org.uk/show.php?id=407 Silky Wave at UK Moths] *[https://web.archive.org/web/20160304210315/http://www.faunaeur.org/full_results.php?id=444131 Fauna Europaea] *[http://www.lepiforum.de/lepiwiki.pl?Idaea_Dilutaria Lepiforum.de] {{Taxonbar|from=Q137085}}

{{DEFAULTSORT:Idaea Dilutaria}} Category:Idaea Category:Moths of Europe Category:Moths described in 1799 Category:Taxa named by Jacob Hübner

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