Hi, I've been working on my Tamez line which goes back to China, Nuevo Leon. I've gotten as far back as Felipe Tamez, married in 1823 in China, NL to Maria Rita Villarreal. Their son, Jesus Tamez was born about 1836, married in 1860 to Expectacion Garcia, and their son Eliodoro was born in 1861 (I believe he was actually born in Cadereyta). Eliodoro is my great grandfather. I believe Felipe's parents are Juan Jose Tamez and Maria Josefa Luna, but I need to verify that. If anyone connects to that line, please contact me: firstname.lastname@example.org.
Also, you may be aware, but two very helpful books were published since 2000, but they are a little hard to find in libraries:
China, Nuevo Leon: Raices Genealogicas 1795-1850 China, Nuevo Leon: Raices Genealogicas 1851-1900
Both are by Ernesto Tijerina Cantu. These books have extracted information from the parish records of San Felipe de Jesus in China and from the Registro Civil. I've only been able to see the second volume and it's been an incredible help in my research.