Papilio machaon bairdii W. H. Edwards, 1866
Status: Uncommon/rare resident
NENHP Ranking: S3, Tier 2
Range: Various subspecies and forms of Papilio machaon are found from Alaska south into most of Arizona and New Mexico, and in southern Canada east into Quebec. In Nebraska the yellow form “brucei” ranges from the panhandle southeast through the loess hills of the south central counties.
Broods/Flight Times: At least two broods. It has been found here from mid-April to mid-September
Larval Hostplant(s): Silky Wormwood (Artemesia dracunculus) is the primary host plant although it has also been reared from larvae found on Musineon tenuifolium at Scotts Bluff National Monument.
Habitat: This swallowtail restricts itself to rugged country, with females preferring to lay eggs on plants on or atop steep hills or cliffs. In doing so it has also utilized some manmade habitats such as canal banks and road cuts.
Found at: Box Elder & Wapiti SWMAs, Gallagher Canyon & Medicine Creek Reservoir SRAs, Cedar Point Biological Station (Keith Co) and Scotts Bluff National Monument
Overwintering: As a pupa
Similar Species: Anise Swallowtail
Notes: This butterfly is noted for its multi-year boom and bust cycles. Doug Long of Holbrook (Furnas County) noted …