There are very few reported cases of hybridization among the four species of Piranga commonly found in North America north of Mexico, the Hepatic Tanager (Piranga flava), Summer Tanager (P. rubra), Scarlet Tanager (P. olivacea), and Western Tanager (P. ludoviciana). McCormick (1893) reported a bird presumed to be a hybrid between the Scarlet and Summer tanagers. Subsequently, Tordoff (1950) and Mengel (1963) described birds hypothesized to be products of hybridization between the Scarlet and Western tanagers. The one hybrid of Piranga regularly occurring in the United States is the Western Tanager × Flame-colored Tanager (P. bidentata) (Morse and Monson 1985, Rosenberg and Jones 2001, Williams 2007, Retter 2008, S. O. Williams pers. comm.). This hybridization is not unexpected, as the Flame-colored Tanager is at the extreme northern edge of its range in the United States (Arizona) and the two species are each other’s closest relatives (Burns 1998). Rosenberg and Jones (2001) suggested that, in Arizona, these hybrids may be more frequent than pure Flame-colored Tanagers, particularly in the Huachuca Mountains (G. Rosenberg pers. comm.). There are no published reports of hybridization between the Summer and Western tanagers, in spite of large areas of the southwestern United States in which both the Western Tanager and the western subspecies (cooperi) of the Summer Tanager occur.