Hi, I need help to ID a large 2.5-3" black w/yellow.She has swallowtail-like markings on her back. Her web is circular with a different kind of silk in 2 zig-zags above and below her. bi-coloured legs beige/black. Pincers? in front. Can anyone direct me to a spider site that searches by web or colour?. I don't know her species etc. Thanks in advance for any suggestions Tana