Comparison - Banded Hairstreak

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Banded Hairstreak (Satyrium calanus falacer) male. Manotick, Ont. [Reared on] White Oak. [Emerged] 2.IV.48 Forest Insect and Disease Survey
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Edwards' Hairstreak (Satyrium edwardsii) male. Pontypool, Durham Co., Ont. 10.VII.62 W.M.M. Edmonds
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Hickory Hairstreak (Satyrium caryaevorum) female V. Jockvale, Ont. 25.VI.43 J. McDunnough
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Comparison - Banded Hairstreak with Similar Species

The much more common Banded Hairstreak (S. calanus) is highly variable and some forms are frequently confused with the Hickory Hairstreak. In the Banded Hairstreak the white-edged dark band on the hindwing underside is a series of dark rectangular spots margined mainly on the outside in white; the top-most spot in this band is similar in size and shape to the others, but is offset towards the base of the wings, much narrower than the partial second band near the middle of the wing; and the orange and black spot between the two tails (adjacent to the blue spot) is a reddish crescent above a black triangular spot and is as large as the black spot. In the Hickory Hairstreak the series of spots forming the dark band is progressively wider towards the top, so that the offset top spot is as wide as the partial second band and the black spot between the two tails has an orange line capping it that is much smaller than the spot. The two species differ significantly in genitalic structure. The lack of an orange cap on the blue spot on the hindwing underside means that the Edwards' Hairstreak is likely to be confused only with the Banded and Hickory Hairstreaks (S.calanus and S. caryaevorum). In both of these species the dark spots beneath are rectangular and fused to form a band rather than being broken into rounded spots, and there is only a small amount of orange on the inner margin of the hindwing beneath.