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DESCRIPTION OF PREPARATORY STAGES OF ARGYNNIS IDALIA, Drury
Published online by Cambridge University Press: 31 May 2012
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EGG–Shaped like that of Diana and Cybele; conoidal, truncated, rounded at base, the sides well rounded ; depressed at summit ; marked vertically by about 18 vertical ribs, somewhat wavy, half extending from base to summit, the remainder ending irregularly at about three-fourths the distance from the base ; between each pair of ribs are equi-distant, transverse, slightly raised striæ. Duration of this stage about 25 days.
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