The 1790 Head of Households Census for New London County CT, page 115 in column three lists these Maine families that are believed to be in the area that became North Stonington, but was Stonington in 1790:

                                                                                          Columns below are males 16 & over, males under 16 and then females.

Immediately below "Peter Maine 3" below, the name "Christopher ??ly" appears and is indexed as Christopher Heby. I can't find this Heby (or any Heby) anywere and don't believe it looks like it reads "Heby."


 

Please email me if you know of this family or have suggestion for a name and family I should check.  The correct lead could solve a long standing mystery for many Christopher Main researchers.
 

Using the data at  http://freepages.genealogy.rootsweb.com/~nanc/main/findex5.htm
these would appear to be the family units as of 1790:

95. Asa MAIN (Peter , Jeremiah , Ezekiel ) was born 17 Jun 1748 in Stonington, New London Co., Connecticut.
      He died in Cortland Co., New York. Asa-4, son of Peter and Mary (Egglestone) Maine, was born at No. Stonington, CT
      June 17, 1748.  Asa married (1) Miss BILLINGS about 1768/1769.  Asa and Miss  Billings had the following children:
           360 M   i Asa (See #360 below)
           361 M  ii Zadock MAIN was born about 1783 in No. Stonington, New London Co., Connecticut.
           362 M iii Samuel MAIN was born 21 Feb 1785 and died 1 Aug 1845.
           363 M iv Isaac MAIN was born 28 Nov 1788 and died 30 Apr 1865.
          
360. Asa MAIN (Asa , Peter , Jeremiah , Ezekiel ) was born about 1769 in No. Stonington, New London Co., Connecticut.
        He died 11 Mar 1841 and was buried 13 Mar 1841 in McLean Cemetery, Groton, Tompkins Co., New York.
        Asa married (1) Content. Content was born 1772 in No. Stonington, New London Co., Connecticut.

29. Peter MAIN Jr. (Jeremiah , Ezekiel ) was born 5 Aug 1718 in Stonington, New London Co., Connecticut and
      was christened 25 Oct 1719 in 1st Church of Stonington, Stonington, New London Co., Connecticut.
      note: the "Jr" designation for #29 appears wrong and perhaps should be "Sr" or just plain Peter. #92 should be "Jr."
      Peter married Mary ECCLESTON, daughter of Joseph ECCLESTON and Sarah MOTT, on 17 Sep 1740 in Stonington.

92. Peter MAIN (Peter , Jeremiah , Ezekiel ) was born 9 Jul 1742 in Stonington, New London Co., Connecticut.
      He died about 1790 in Stonington, New London Co., Connecticut. He married, March 3, 1765, Patience Egglestone. daughter of
      Joseph ECCLESTON Jr. and Coran, on 3 Mar 1765 in Hopkinton, Kings Co., Rhode Island. Patience was born 6 Jun 1744 in No.
      Stonington, New London Co., Connecticut. She died 2 May 1836 in Hopkinton, Kings Co., Rhode Island.
           349 M    i Peter (3rd? see 349 below)
           350 F   i i Agnes MAIN was born 4 Aug 1767
           351 M iii Joseph MAIN was born 21 Sep 1769.
           352 F   iv Philena MAIN was born 12 May 1771
           353 F    v Polly MAIN was born 9 May 1774
           354 M vi Amos MAIN was born 16 Aug 1776 and died 9 Jun 1855.
           355 M vii Jared MAIN was born 22 Jan 1778 and died 10 Apr 1857.
           356 Mviii John MAIN was born 6 Apr 1780 and died 1851.
           357 F    ix Deborah MAIN was born 6 May 1782.
           358 M   x David MAIN was born 20 Aug 1784.
           359 F    xi Prudence MAIN was born 3 May 1789 and died 18 Dec 1848.

349. Peter MAIN (Peter , Peter , Jeremiah , Ezekiel ) was born 4 Dec 1765 in Stonington, New London Co., Connecticut.
        Peter married an unknown Miss who was born about 1768 in No. Stonington, New London Co., Connecticut.