Here is the list (I hope I can do this in 2 posts or less)
Alpha Delta Theta
- Primary cause of decease: Merger with Phi Mu
- Founded in the fall of 1919 at Transylvania College
- Had 25 chapters
- Joined the NPC in January 1926 and was the first national to be recorded as an associate member of the NPC
- Merged with Phi Mu at the close of the NPC Conference in November 1939.
- Hazel Falconer Benninghoven, ADT national president at the time of the merger, later became the national president of Phi Mu, perhaps the only person to serve as national president of two NPC orgs.
Alpha Kappa Psi
- Primary cause of decease: Weak organization(?)
- Founded in 1904 at St. Mary's School
- Had about 8 chapters
- No info was given as to whether it merged or dissolved, only that total membership was about 600
Alpha Sigma Delta
- Primary cause of decease: Merger with Lambda Omega (see listing)
- Founded in 1919 at the University of California
- Does not indicate any additional chapters acquired
- Merged with Lambda Omega in April 1932
Beta Phi Alpha
- Primary cause of decease: Merger with Delta Zeta
- Founded May 8, 1909 at the University of California, Berkeley originally named Bide-a-wee, changed its name to Aldebaran a few months later, then to Kappa Phi Alpha in 1919, and finally Beta Phi Alpha when the movement toward expansion gained strength.
- Had over 30 chapters
- Merged with Delta Zeta 6/22/41
Beta Sigma Omicron
- Primary cause of decease: Merger with Zeta Tau Alpha
- Founded 12/12/1888 in Columbia, Missouri
- Had 61 chapters
- Merged with Zeta Tau Alpha August 1964
- 15 chapters were active at the time of merger, of these three chapters did not wish to affiliate and reverted back to local status, one of which retaining the name Beta Sigma Omicron.
Delta Sigma
Almost Delta Sigma Theta, but not quite 
- Primary cause of decease: Merger with Alpha Omicron Pi
- Founded 1895 at Tufts College
- Had 3 chapters, 2 of which merged with AOPi, the third died out when sororities were abolished at Brown University in 1911.
Delta Sigma Epsilon
- Primary cause of decease: Merger with Delta Zeta
- Founded 9/23/14 at Miami University
- Had 52 chapters, of which 44 were active, some due to a merger with Phi Omega Pi (see listing).
- Merged with Delta Zeta in 1956
Iota Alpha Pi
- Primary cause of decease: Weak organization
- Founded at Hunter College in 1903
- Had 23 chapters, 13 active, 10 inactive
- Disbanded in 1971
- Notable fact: their pin was a diamond shaped pin that was surrounded by a border of
twenty pearls *hint hint*
Lambda Omega
- Primary cause of decease: Merger with Theta Upsilon (see listing).
- Founded 5/5/23 at the University of California
- Had 8 chapters
- Merged with Theta Upsilon in September 1933
Phi Omega Pi
- Primary cause of decease: Merger with Delta Zeta
- Founded 3/5/10 at the University of Nebraska
- Had an unknown number of chapters, but acquired Sigma Phi Beta (see listing).
- Joined the NPC October 1933.
- 3 chapters were inactive when POP joined the NPC. Subsequently, chapters were taken over by Alpha Omicron Pi, Alpha Gamma Delta, Sigma Kappa, and Kappa Alpha Theta.
- The group disbanded in 1946, but through an NPC committee, Delta Zeta was asked to consider the alumnae and a few chapters which remained. The merger with Delta Zeta became official on 8/10/46.
Pi Delta Theta
- Primary cause of decease: Merger with Delta Sigma Epsilon
- Founded in 1925 and Alpha Chapter installed 2/14/26 at Miami University.
- Had 29 chapters, 4 active, 5 inactive, and 20 alumnae.
- Merged with Delta Sigma Epsilon in September 1941.
Pi Kappa Sigma
- Primary cause of decease: Merger with Sigma Kappa
- Founded 11/17/1894 at Michigan State University as J.P.N. It became Pi Kappa Sigma in 1897.
- had 48 chapters
- Merged with Sigma Kappa 5/15/59
Pi Lambda Sigma
- Primary cause of decease: Merger with Theta Phi Alpha
- Founded June 1921 at Boston University
- Had 4 chapters
- Merged with Theta Phi Alpha 6/28/52
Sigma Phi Beta
- Primary cause of decease: Merger with Phi Omega Pi
- Founded 11/1/20 at New York University originally under the name of Sigma Sigma Omicron until 7/28/27.
- Amalgamated with Phi Alpha Chi 1/7/28, having similar purposes and interests to become Sigma Phi Beta.
- Had 8 chapters, 3 coming from the former Phi Alpha Chi.
- Merged with Phi Omega Pi on 10/1/33.
Sigma Sigma Omicron
(see Sigma Phi Beta)
Theta Sigma Upsilon
- Primary cause of decease: Merger with Alpha Gamma Delta
- Founded 3/25/21 at Kansas State Teachers College originally as a local founded in 1909 as the Sigma Society, but had its name changed when the org went national.
- Had 23 chapters
- Merged with Alpha Gamma Delta 6/29/59
Theta Upsilon
- Primary cause of decease: Merger with Delta Zeta
- Founded 1914 at the University of California
- Joined the NPC as an associate member in 1923, and as a full member in 1928
- had 39 chapters, four of which from acquiring Lambda Omega (see listing).
- Merged with Delta Zeta 5/6/62.
Trianon
- Primary cause of decease: Weak organization(?)
- Founded 12/28/29 at the University of Cincinnati(?).
- Had 4 chapters.
- Baird's does not specify whether this group was dissolved or was acquired by another organization.
Well, that's all the sororites. Baird's does include professional and honor societies that died out, but that goes beyond the scope of the purpose of our discussion here, so that will be excluded.
A summary will be posted in the "NPHC..10th group" thread later on.
Hope you've enjoyed your time here--I will be back to post some related questions that ties Mccoyred's initial post and my initial post, so we will be having another merger of some sort *LOL*
So drive carefully, and all that other good stuff.
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Linear Mode
