Family: Lycaenidae, Gossamer-wing Butterflies view all from this family

Description Callophrys sheridanii, common name Sheridan's Hairstreak and Sheridan's Green Hairstreak, is a butterfly in the Lycaenidae family. It is found along the south coast of British Columbia and parts of Nevada, Arizona, Saskatchewan, North Dakota, and New Mexico. This species was adopted as the Wyoming state butterfly in 2009.

This small, tail-less butterfly has a wingspan of 20–24 millimetres (0.8–0.9 in). The upperside is dark gray-brown, with underside colour ranging from a bright green to dark gray-green. The lower part of the forewing is gray. Callophrys sheridanii has a white postmedian line of dots that may be straight or bluged out, and even reduced or absent. It is named for its characteristic straight, white line crossing the underside of both wings, although this may be less distinct in specimens from southern British Columbia.

Dimensions This small, tail-less butterfly has a wingspan of 20–24 millimetres (0.8–0.9 in).

Habitat Alpine & subalpine habitats, Canyons & caves, Grasslands & prairies, Scrub, shrub & brushlands.

Range California, Plains, Northwest, Southwest, Rocky Mountains, Western Canada.