Idaea dilutaria, also called the silky wave, is a moth of the family Geometridae. It is found in Europe.
Fig 1,1a Larvae in various stages 1b enlarged details of segments
The species has a wingspan of 20–22 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.[1]
^The flight season refers to the British Isles. This may vary in other parts of the range.
References
^Prout, L. B. (1912–16). Geometridae. In A. Seitz (ed.) The Macrolepidoptera of the World. The Palaearctic Geometridae, 4. 479 pp. Alfred Kernen, Stuttgart.pdf This article incorporates text from this source, which is in the public domain.
