I searched on ancestry and the surname does show up referenced to the 1891 Galician business directory. I also searched for Katus on Rootsweb and it shows up from Poland. Perhaps it is a Polish surname. I was thinking too it might be a variation of a name like Cha_ush but it's most definitely a "t" in the name.
You really have to use your imagination in reading these records, I keep looking back at the names and often the name just pops out at me where before it was illegible.