http://louisiananaturalist.blogspot.com/2009/06/four-dark-swallowtails.html
top left - female Eastern Tiger Swallowtail, dark morph
top right - Zebra Long Wing
bottom left - female Eastern Tiger Swallowtail, yellow form
bottom right - Gulf Fritillary - from butterfly forum at whatbird.com - "Not positive but I think the extensive black veining above points to a female"