If you thought the Monarch (Danaus plexippus), was the only royal butterfly of North America you would be wrong. Another royal member, the Queen (Danaus gilippus) is a cousin to the Monarch and also adorns our gardens with its lovely orange wings.
The Queen is chiefly a tropical species. In the United States, it’s usually confined to the southern regions. It’s quite common in Florida and southern Georgia, as well as in the southern parts of Texas, California, and other states bordering Mexico, including Arizona and New Mexico. Periodically, a stray may be found in the Midwest. Because of climate change, they may even stray farther north as time goes on.
Queens and Monarchs are often mistaken for each other in their various life stages because of their resemblances. But if you look closely, it’s not that hard to tell the difference between Monarchs and Queens.
Like the Monarch, caterpillars of the Queen also feed on different species of Milkweeds. The larvae of the Queen butterfly have an extra set of filaments the soft horn-like structures on their topside. The Queen caterpillar, similar to the Monarch, has black, yellow, and white stripes, but the pattern varies.
The chrysalis of the Queen is identical to that of the Monarch, but is typically smaller. Also, sometimes has a pink hue.
Like male Monarchs, male Queens have a black spot on each hindwing. These black dots are pheromone scales. Although Monarch butterflies do not use pheromones during courtship and mating, Queen butterflies do use them.
Although the Queen does not undertake dramatic migrations like the Monarch, will travel short-distances at tropical latitudes in areas that have a distinct dry season. During those periods, the Queens will fly from lowlands to higher elevations. (Krizek, Paul A. and Opler, George O. Butterflies: East of the Great Plains: An Illustrated Natural History. Baltimore: Johns Hopkins University Press, 1984.)