Butterflies of the Adirondack Mountains: American Lady (Vanessa virginiensis) at the Paul Smiths VIC Native Species Butterfly House

Butterflies of the Adirondack Mountains:
American Lady (Vanessa virginiensis)

Adirondack Butterflies: American Lady (Vanessa virginiensis) at the Paul Smiths VIC Native Species Butterfly House (12 July 2012) Butterflies of the Adirondacks: American Lady at the Paul Smiths VIC Butterfly House (12 July 2012)

The American Lady Butterfly (Vanessa virginiensis) is a migratory butterfly that may be seen in the Adirondack Mountains in upstate New York during July and August. It is a member of the Brushfoot Family. The species is named for Virginia. [1] This butterfly is also called the American Painted Lady, Hunter's Butterfly, and Virginia Lady. [2] [3] The American Lady is a member of the Brushfoot family. [4] It is one of the Lady Butterflies, a group which also includes the Painted Lady and the Red Admiral. [5] [6]

The American Lady is a medium-sized butterfly, about 1.75 to 2.125 inches in wing span. [7] Seen from above, it displays pinkish orange with black marks across the fore wing. [8] The tip of the fore wing has black marks. There is usually a small white spot in the orange cell by the upper wing margin, which helps distinguish it from the similar Painted Lady (Vanessa cardui). [9] [10] [11] The black median marks are usually not connected, in contrast to the slightly larger Painted Lady, whose black median band forms a semicircle. [12] [13] The underside of the American Lady has a complex pattern of olive, black and white, with two large blue eye spots near the outer margin on an olive field on the hind wing.[14] [15] The similar Painted Lady, by contrast, has four smallish eye-spots. [16]

The American Lady is a fast-flying butterfly and often lights on flowers and other objects with its wings spread. [17] During the afternoon, males perch on hilltops or on low vegetation if there are no hills. [18] The butterflies spend a great deal of time on bare ground with their wings almost fully open. American Ladies feed almost exclusively on flower nectar, including that of the pearly everlasting, dogbane, aster, goldenrod, marigold, and common milkweed. [19] The adult butterflies reportedly live from six to twenty days. [20]

Butterflies of the Adirondack Mountains: American Lady (Vanessa virginiensis) at the Paul Smiths VIC Native Species Butterfly House (30 July 2012)Butterflies of the Adirondacks: American Lady at the Paul Smiths VIC Butterfly House (30 July 2012)

The American Lady butterfly lays yellowish-green, barrel-shaped eggs singly. [21] [22] The resulting caterpillar is about 1.375 inches long and is black with yellow cross bands. [23] [24] [25] Caterpillar hosts include plants in the sunflower family, pearly everlasting, and ironweed. [26] [27] The insect forms a gold-spotted brown chrysalis about 22 mm long. [28]

In terms of ecology, the American Lady is a generalist which is extremely widespread and adaptable. [29] This butterfly may be found in a wide variety of habitats, including roadsides, sunny open spots, gardens, old fields, meadows, forest clearings, and stream beds. [30] [31] [32] The American Lady is said to be more cold-tolerant than the Painted Lady. [33] [34]

Although some sources suggest that the American Lady is only occasionally migratory, [35] [36] most references indicate that the American Lady overwinters in the southern U.S. and then migrates north in the spring, [37] sometimes in large numbers. [38] Some southward migration in the fall has also been noted. [39] Its range extends from southern Canada southward to northern South America. [40] It is quite common in the eastern US, rarer in the West. The American Lady is seen occasionally in Europe, Hawaii, and the larger Caribbean islands. [41]

Butterflies of the Adirondack Mountains: American Lady (Vanessa virginiensis) at the Paul Smiths VIC Native Species Butterfly House (4 August 2012)Butterflies of the Adirondacks: American Lady at the Paul Smiths VIC Butterfly House (4 August 2012)

The flight period for American Ladies in the New York City area of New York State is from late April to early October; they are most abundant around New York City in the first half of May and the first half of July. [42] Although the American Lady's flight period in the Adirondack Park has not been established, two American Ladies were seen in nearby Bloomingdale Bog in late May 2012. [43] American Lady butterflies were present in 2012 in the Paul Smiths VIC Native Species Butterfly House and in the adjacent Butterfly Garden in July and August. [44] It is not clear whether American Ladies from our part of the Adirondacks attempt a southward migration. Some may, but many others apparently die here in the Adirondack Mountains, to be replenished with others migrating from the south in the spring. [45]

References



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