The Little San Bernardino Mountains of Riverside and San Bernardino Counties in southern California support a peninsula of oak-pine woodland running southeast from the higher San Bernardino Mountains (Figure 1). In spite of the continuity of the woodland connecting the two ranges, the birds of the Little San Bernardino Mountains are remarkably differentiated from populations to the west. Three subspecies requiring woodland are endemic to the range: a Mountain Quail, Oreortyx pictus russelli, a Plain Titmouse, Parus inornatus mohavensis, and a Bushtit, Psaltriparus minimus sociabilis (Miller 1946), and another, a Scrub Jay, Aphelocoma coerulescens cana, is endemic to the nearby Eagle Mountains (Miller 1946, Pitelka 1951).