I know I've covered this topic before, but I can't stress this enough. When doing Hispanic research, also search for the wife using her maiden name. In the 1870 census, I found my g-g-grandmother with her maiden name. Listed under her name, my great grandfather was listed with ditto marks for his surname. This was wrong. If I had been looking for him with his father's surname, I wouldn't have found him. I surmised that gggrandfather had died before the this census. I found him in the mortality schedule in 1869.