Tulane has: Kappa, Chi-O, SDT, AEPhi, Theta, and PiPhi. Their Web site says nothing about Tri-Delt, though. I think they also had AOII as recently as 2000, but no longer. Here is a link to the list of all Greek orgs. on their campus:
http://studentprograms.tulane.edu/or...t.php?typeID=3