Dallas County Lepidopterists' Society

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Eastern Black Swallowtail (Papilio polyxenes asterius)
f. "pseudoamericus"  





Caterpillar HostplantsDill (Anethum graveolens), fennel (Foeniculum vulgare), parsley (Petroselinum crispum), celery (Apium), carrot (Daucus), Queen Anne's Lace (Daucus carota), Prairie-parsley (Polytaenia nuttallii), Water-Parsnip (Berula erecta), Water Hemlock (Cicuta maculata), Wild Chervil (Cryptotaenia canadensis), Leaf-Less Cowbane (Oxypolis filiformis), Mock Bishop's Weed (Ptilimnium capillaceum), Water- Parsnip (Sium suave), Forked Scaleseed (Spermolepis divaricata) and other members of the family Apiaceae. Rue (Ruta graveolens) and Dutchman's-Breeches (Thamnosma texanum) in the family Rutaceae are utilized.
Area Sighting
Commonly found in open meadows where its larval host plants are plentiful, this species is also a frequent visitor to the backyard garden.
Seasonal Flight DataEarly March - October
General NotesA sexually dimorphic species, both male and females have black wings with a row of yellow spots along the margins, far more pronounced in the male. The hindwing has a submarginal band of blue which is much more extensive in the female. Similar species: Pipevine Swallowtail (Battus philenor), which it is believed to mimic, dark form female Tiger Swallowtail (Papilio glaucus).

Additional Photographs





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