Lange’s metalmark butterfly is currently found only at Antioch Sand Dunes in Contra Costa County and was listed on the Federal Endangered Species List in 1976.
The Metalmark is a fragile, brightly colored butterfly with wingspans from 1 to 1.5 inch. Dorsal wings are largely black with white spots. Red-orange coloration extends through the inner forward half of the forewing, the hindwing bases, and a small central patch subtended by black. Below, the wings have a more muted pattern of gray, white, black, and orange.
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