I found some more!
Phi Tau Omega National Philanthropic Sorority (reference on the website of the Arma, Kansas, Public Library) -- Google doesn't turn up anything
Interestingly, on the website for Heartspring, an agency in Wichita, KS (
www.heartspring.org), under "Caring Hearts," there are references to *four* sororities:
Sigma Alpha (somehow this org's website is hosted by Heartspring??)
Chi Sigma Sorority (no web info?)
Alpha Iota Sorority (no web info?)
Lambda Delta Tau (no web info?)
(BTW, Heartspring was founded as the Institute for Logopedics. That used to be the national philanthropy for an NPC group -- KAT? or KD?)
AGDAlum