Callophrys irus, the frosted elfin, is a species of Lycaenidae that is native to North America.
The top side of the wing is brown, males have long oval dark spots on the leading edge of their forewings.
There is one flight period from March to April in the south and in the north it is on wing from mid-May to early June.
Larval foods include the pea family (Fabaceae), indigo (Baptisia tinctoria), lupine (Lupinus perennis), and rattlebox (Crotalaria sagittalis).
[4] In 2011, zoologists with the Virginia Department of Conservation and Recreation found populations of the butterfly in the city of Suffolk, Virginia, and a volunteer also found a population at Antioch Pines Natural Area Preserve.