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Syngrapha interrogationis
''Syngrapha interrogationis'', the scarce silver Y, is a moth of the Noctuidae family. It is found in the Northern areas of the world, from Alaska, through Canada, Iceland, Europe, Siberia up to Northeast Asia including Japan.
==Technical Description and variation==
:''See glossary for terms used''
The wingspan is 32–38 mm. "Forewing bright purplish grey, suffused with black in median area and towards apex; the edges of the stigmata and the lines lustrous grey; inner and outer lines black, double; the inner sinuous above middle, and forming three small curves below it; the outer regularly crenulate throughout; the subterminal line preceded by a conspicuous black dentated and indented line, with a blackish cloud towards apex; a row of pale grey lunules before the terminal marks; the subcellular silvery mark highly variable, either forming a simple loop with fine silvery edge, - ab. ''orbata'' ab. nov. (), — or followed by a small silvery dot, as in the type form, or by a large round spot conjoined to it, rarely separate, — ab. ''flammifera'' Huene ; a development of this last, - ab. ''ignifera'' ab. nov. {Warren] — has the usual silvery mark pale yellow, as in some examples of ''flammifera'', shaped like a tadpole, with deep fiery red scaling before the outer line, beyond the inner, and along the submedian fold; hindwing brownish luteous clouded with darker and with a broad blackish border; the type, male from Livonia, is in the Tring Museum; the subsp. ''transbaikalensi''s Stgr., from Dauria and East Siberia, is more uniform bluish grey, with very little black suffusion on forewing and paler, hindwings; this form is also recorded from Esthland by Petersen; ab. ''rosea'' Tutt, from Scotland, has a rosyground colour in place of bluish grey; ab. ''cinerea'' ab. nov. () has the ground colour dull ashy grey with scarcely any dark markings, except the subterminal line, and no purplish suffusion, the silvery mark a somewhat triangular loop; of this form the Tring Museum possesses 3 examples from Cedre, Hautes Pyrenees; in the same museum is still another grey form, much resembling cinerea, but with a complete silvery gamma mark and somewhat more developed dark shades; this specimen is from Cauterets in the Pyrenees, and may be distinguished as ab. ''gammifera'' ab. nov. () ; these last two grey forms are probably specifically distinct from ''interrogationis'' L. "〔Seitz, A. Ed., 1914 ''Die Großschmetterlinge der Erde'', Verlag Alfred Kernen, Stuttgart Band 3: Abt. 1, Die Großschmetterlinge des palaearktischen Faunengebietes, Die palaearktischen eulenartigen Nachtfalter, 1914 〕
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