Range. - Guadalupe Island, Lower California.

A similar but darker and browner species than the Rock Wren. It breeds in abundance throughout the island from which it takes its name, placing its nests in crevices among the boulders or cavities of fallen tree trunks and, as is often done by the last species, lining the pathway to the nest with small pebbles. The eggs, which are laid from January to April, resemble, in all respects, those of the common Rock Wren.