''Callophrys polios'', the hoary elfin, is a

butterfly Butterflies are insects in the macrolepidopteran clade Rhopalocera from the order Lepidoptera, which also includes moths. Adult butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. The group comprises ...

of the family

Lycaenidae Lycaenidae is the second-largest family of butterflies (behind Nymphalidae, brush-footed butterflies), with over 6,000 species worldwide, whose members are also called gossamer-winged butterflies. They constitute about 30% of the known butterfly ...

. It has a very local distribution in the United States from

Maine Maine () is a U.S. state, state in the New England and Northeastern United States, Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Provinces and territories of Canad ...

south to

New Jersey New Jersey is a U.S. state, state in the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. It is bordered on the north and east by the state of New York (state), New York; on the ea ...

and in the

Appalachian Mountains The Appalachian Mountains, often called the Appalachians, (french: Appalaches), are a system of mountains in eastern to northeastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. The ...

Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the East Coast of the United States, Atlantic Coast and the Appalachian Mountains. The geography an ...

, west across the Great Lakes states and the southern prairie provinces and north to

Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S ...

. Along the Pacific Coast it is found to northern

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the ...

and in the

Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in straight-line distance from the northernmost part of western Canada, to New Mexico in ...

south to northern

New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe, New Mexico, Santa Fe , LargestCity = Albuquerque, New Mexico, Albuquerque , LargestMetro = Albuquerque metropolitan area, Tiguex , Offi ...

. It is listed as a species of special concern and believed

extirpated Local extinction, also known as extirpation, refers to a species (or other taxon) of plant or animal that ceases to exist in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinct ...

in the US state of

Connecticut Connecticut () is the southernmost state in the New England region of the Northeastern United States. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and Long Island Sound to the south. Its cap ...

. The

wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingspan ...

is 22–29 mm. The upperside is orangish brown and the underside brown. The forewing outer margin is frosted white and has an irregular postmedian line, which is white. The outer half of the hindwing is frosted light gray. Adults are on wing from April to June in one generation. The larvae feed on ''

Arctostaphylos uva-ursi ''Arctostaphylos uva-ursi'' is a plant species of the genus ''Arctostaphylos'' widely distributed across circumboreal regions of the subarctic Northern Hemisphere. Kinnikinnick (First Nations for "smoking mixture") is a common name in Canada and ...

'' and possibly ''

Epigaea repens ''Epigaea repens'', the mayflower, trailing arbutus, or ground laurel, is a low, spreading shrub in the family Ericaceae. It is found from Newfoundland to Florida, west to Kentucky and the Northwest Territories. Description The plant is a slow- ...

''. The adults feed on flower nectar from various species, including

leatherleaf ''Chamaedaphne calyculata'', known commonly as leatherleaf or cassandra, is a perennial dwarf shrub in the plant family Ericaceae and the only species in the genus ''Chamaedaphne''. It is commonly seen in cold, acidic bogs and forms large, sprea ...

, pyxie, wild strawberry and

willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist ...

. Hibernation takes place as a chrysalid.

Subspecies

*''Callophrys polios polios'' *''Callophrys polios obscura'' Ferris & Fisher, 1973 (Colorado) *''Callophrys polios maritima'' Emmel, Emmel & Mattoon, 1998 (California) Incisalia_polia

References

Callophrys Butterflies of North America Butterflies described in 1907 {{Eumaeini-stub