Tur·nus n.  Zool. A common, large, handsome, American swallowtail butterfly, now regarded as one of the forms of Papilio glaucus syn. Jasoniades glaucus.  The wings are yellow, margined and barred with black, and with an orange-red spot near the posterior angle of the hind wings.  Called also tiger swallowtail. See Illust. under Swallowtail.

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