High Quality Content by WIKIPEDIA articles! The Xerces Blue butterfly (Glaucopsyche xerces) is an extinct species of butterfly. The species lived in coastal sand dunes of the Sunset District of San Francisco. The Xerces butterfly is believed to be the first American butterfly species to become extinct as a result of loss of habitat caused by urban development. The last Xerces Blue was seen in either 1941 (Garth, J.S. and J.W. Tilden, California Butterflies, UC Press 1986) or 1943 (Powell, J.A. and C.L. Hogue, California Insects, UC Press, 1979) on land that is part of Golden Gate National Recreation Area. The Xerces butterfly is one of the few butterflies species that start with the letter X.

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