Pitka 1946 June 25 Alpine Co, Calif., and Douglas Co., Nevada. as far as Diamond Valley in Alpine County; that "intergradation" occurs in the bridge of piñon-juniper connecting the Pine Nut Mts. and the Sierra Nevada, probably in the Pine Nut Mts. themselves and possibly in the northern Stillwater Mountains and the neighboring Sierra Nevadan slopes to the west. That nevadae can cross the broad lowland barrier to the north, however, is clearly indi- cated by records from Sutcliffe and the Granite Range. Nothing is known of the breeding populations of scrub jays in the Granite, Lake, and Nightingale ranges (see maps on following page), although I would now suspect that superciliosa occurs in all of these. If free interbreeding occurs between nevadae and superciliosa in southern Douglas County, it would appear to occur over a relatively restricted area, with rather striking changes occurring in characters over relatively short distances. Continuity in habitat here is such that supercilirosa and nevadae must meet. Apparently, judging from the one specimen obtained, they interbred, but concerning guestion regarding behavior of characters