The White-collared Swift (Streptoprogne zonaris) ranges from Argentina and Bolivia in the south to the West Indies and Mexico in the north (Howell and Webb 1995, American Ornithologists’ Union 1998). Howell and Webb (1995) described the species as an uncommon nonbreeding transient, vagrant, or winter visitor in the west-central part of Mexico and suggested that birds from Jalisco and Colima might belong to the subspecies albicincta from southern Central America. Edwards (1972) reported the swift without details from Nayarit, and a few northerly vagrants have been reported in the United States (Hardy and Clench 1982, Lasley 1984, Erickson et al. 1989, American Ornithologists’ Union 1998). The northernmost breeding population in western Mexico is reported for the state of Guerrero (Rowley and Orr 1962, Howell and Webb 1995).