This compact and sharply-painted small swallowtail is one of summer’s brightest and commonest sprites through western lowlands and foothills. Note the blunt, comparatively short wings, and the clearly defined markings. The similar Bruce’s Swallowtail (Papilio brucei Edw.) has more blue in the wings and is found mainly in the mountains. The similar Oregon Swallowtail (Papilio oregonia Edw.) does not have the wings bordered so widely with black. The design of the yellow spots is very distinctive when studied closely.