Eastern Tiger Swallowtail (Male)

Thanks for the link

Here is a link to a website with more information. http://bugguide.net/node/view/491

The males are just Black and Yellow, but the Females come in two different morphs, one very similar to the male but with blue spots on the hindwing. The other morph is black still with blue spots. Makes for a very beautiful sight when they are seen together.