“Stos.”. Is an abbreviation of “Santos”.

m Mexico Baptisms
Name Maria Franca. Alonso Stos.
Gender Female
Christening Date 21 Dec 1762
Christening Place EL SAGRARIO,AGUASCALIENTES,AGUASCALIENTES,MEXICO
Father's Name Sntiago. Alonso ( De los hinojos)
Mother's Name Theresa “Rosalia” De Stos. Y Bustos
Citing this Record
"México bautismos, 1560-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NKPS-G4T : 10 February 2018), Rosalia De Stos. Y Bustos in entry for Maria Franca. Alonso Stos., 21 Dec 1762; citing EL SAGRARIO,AGUASCALIENTES,AGUASCALIENTES,MEXICO, reference ; FHL microfilm 299,533

Here are some examples:

Name Santiago Alonso De Los Ynojos
Spouse's Name Theresa Rosalia Santos Bustos
Event Date 15 May 1760
Event Place El Sagrario,Aguascalientes,Aguascalientes,Mexico
Citing this Record
"México matrimonios, 1570-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JHPB-L58 : 10 February 2018), Santiago Alonso De Los Ynojos and Theresa Rosalia