Subject: Black Swallowtail – Male
July 14, 2016 3:03 pm
Hi, I am pretty sure this is a young male Black Swallowtail – but just to be sure! Thanks for all you do!
You have correctly identified the species of this Black Swallowtail butterfly, however, you have incorrectly identified its sex. This is a female Black Swallowtail butterfly, as identified by the blue scales on the lower wings. Male Black Swallowtail butterflies lack the blue. This posting from our archives illustrates a pair of Black Swallowtails side by side. See BugGuide for verification, where it states: “Female, with its large blue patches on hindwings, is a mimic of the Pipevine Swallowtail. Some female Black Swallowtails have little yellow on wings above. Males have more extensive broken yellow band.”