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Setina irrorella
The Dew Moth ''(Setina irrorella)'' is a moth of the family Arctiidae. It is found in the Palearctic from Ireland, then through Europe and East to Northern Asia and Central Asia to the Pacific Ocean(Siberia, Kamchatka, Chukotka North Mongolia). It is missing in the high North and parts of the Mediterranean region.It is found also in the limestone Alps up to 2,000 meters above sea level.
==Technical Description and variation==
:''See glossary for terms used''
The wingspan is 27–33 mm. The length of the forewings is 11–18 mm.Light yellow, 3 transverse lines of minute black dots traverse the forewing, hindwing mostly with only one dot in the apex. Beneath, the forewing is glossy sooty grey with the exception of a rather irregular yellow outer margin. Among typical specimens there are found various aberrations, e.g. ab. ''signata'' Borkh., in which the middle rows of spots are united by streaks; ab. ''fumosa'' Sandb., with strongly brownish ground-colour, described from the North, but also found in Germany. —
The species also varies strongly geographically: ''flavicans'' Bdv., from the Mediterranean and Anterior Asia, has brighter deep yellow wings and the apex of the abdomen yellow. — ''nickerli'' Rebel is paler yellow, the forewing slightly dulled with the exception of the clearer yellow inner margin; from the Alps and Northern Europe. This form is often found in collections as ''freyeri''. — True ''freyeri'' Nick., is, however, according to Rebel, the much smaller insect from the highest Alps, in which the dots of the central rows sometimes merge. The black basal spot of the forewing mentioned by Rebel is unessential, and the pale yellow colour is found in ''nickerli'' as well as ''freyeri''. — ''andereggi'' H.-Schiff. has the veins of the forewing dark, appearing like rays; from the high Alps, and in the higher North. — ''riffelensis'' Fell. is considerably smaller, the ground-colour slightly dulled, the black vein-streaks more numerous, especially the costa and median veins strongly sooty black.In the high Alps, especially abundant above Zermatt;— ''lata'' Christ., larger, with broader wings, paler, with very few markings hindwing often quite without markings: from Russia over North Siberia to Kamtschatka. — ''insignata'' Stgr., quite similar to the preceding, but with narrower wings; forewing also with very few dots, and hindwing without any; East Siberia.〔Seitz, A. Ed. ''Die Großschmetterlinge der Erde'', Verlag Alfred Kernen, Stuttgart Band 2: Abt. 1, Die Großschmetterlinge des palaearktischen Faunengebietes, Die palaearktischen Spinner und Schwärmer, 1912- 1913〕
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