Glaucopsyche lygdamus

Xerces Blue
(Glaucopsyche lygdamus xerces)

syn. Glaucopsyche xerces


USA: San Francisco / California

local name:

Xerces Blue - USA

size: (?)

extinction date: last seen in 1941

The Xerces Blue was treated as a full species until recently, but is now considered as subspecies of the Silvery Blue.

This butterfly lived in a very small area on the same peninsula which is now covered by the city of San Francisco. During the construction of this city the habitat of this subspecies was more and more, in the end completely, destroyed.

The last life specimens of this subspecies were seen on the 23. March 1941.


Xerces Blue (Glaucopsyche lygdamus xerces), male

Depiction: Alexander Lang