Tiger Swallowtail (LEP3) Papilio glaucus

Common in every eastern city, this big bright swallowtail prefers phlox and thistle for nectar. A similar species lives throughout the western United States. Both are lemon-yellow with black tiger-stripes. The underside, as shown in the drawing, has a field of blue patches along the outer part. Orange spots run along the outer edge of the hindwing. Here it is on garden phlox.