Tiger Swallowtail: Yellow form (Papilio glaucus turnus). Expanse 3½ to 5 inches. Upper surface of wings bright yellow with each black margin marked with a row of yellow spots. Both sexes throughout its range. Black form (Papilio glaucus glaucus). Black all over with blue markings on outer half of hind wings and row of straw-yellow crescents on borders of same. Females only, and only south of about latitude 40 degrees.
Giant Swallowtail (Papilio thoas or Papilio cresphontes). Expanse 4 to 5½ inches. Upper surface black with two bands of yellow starting at the inner margin of the hind wings and coming together as a row of yellow spots at the outer angles of each front wing. A yellow spot on each black tail. Under surface yellow.
Zebra Swallowtail. Expanse 3 to 3½ inches. Easily known by the stripes of green upon black and the long, slender tails. The different forms vary in size and in the length of the tails. Scientific names are: Early Spring Form, Iphiclides ajax marcellus; Late Spring Form, I. ajax telamonides; Summer Form, I. ajax ajax.
From a photograph from life by A. H. Verrill
CATERPILLARS OF THE GREEN-CLOUDED SWALLOWTAIL
In various stages of growth
