These a bit weathered… I've often seen new ones with the prominences tipped in gold.
Hays Co., Texas
24 October 2013
The observation occurred on the trail from the parking lot (on the left) to the Echo Springs Resurgence (to the right). I did not have a GPS with me at the time and the trail can not be seen on the online map but the location is very close to actual.
The Pipevine can be seen to the far right in the second photo
#50a California Pipevine Swallowtail
Village Creek water treatment facility
The Pipevine Swallowtail or Blue Swallowtail (Battus philenor) is a swallowtail butterfly found in North America and Central America. The butterflies are black with iridescent blue hind wings. They are found in many different habitats, but are most commonly found in forests. The black or red caterpillars feed on Aristolochia species, making them poisonous as both larvae and adults, while the adults feed on the nectar of a variety of flowers.