The Five-striped Sparrow (Aimophila quinquestriata) was first reported in the United States in 1957 just west of Madera Canyon in the Santa Rita Mountains of southeastern Arizona (Binford 1958). The species was not observed in the United States again until 1969 when at least two were found southwest of Patagonia, Arizona, where it has appeared every year since (Snider 1969, 1970, 1971; Monson 1973; Bill Harrison pers. comm.). The 1957 bird was considered an accidental (Phillips et al. 1964) and, because the area had been worked by numerous ornithologists before 1969, the population at Patagonia was considered by many to have just been established. No real effort was made to look for other populations in the United States except for limited explorations in the vicinity of the Patagonia population and in areas to the west by Jim Silliman, Kathy Groschupf and myself in 1975 and 1976. But on 12 June 1977 a Five-striped Sparrow was seen in lower Sycamore Canyon south of the Atascosa Mountains, Santa Cruz Co., Arizona (Bill Harrison pers. comm.). That report instigated a thorough search of Sycamore Canyon and, ultimately, an extensive search in the vicinity of the Atascosa and Santa Rita mountains. This paper reports the results of those searches.