Due to a fire in the records office, most of the 1890 census is missing. I've tracked Loustalots in California in the 1890's from the voter rolls, but that won't help me in following up on Louis in Nevada.
In 1892, the registrations show Frank and Pierre Loustalot living in Santa Barbara county, Frank with a small scar over his right eye. They were both born in France, and became naturalized citizens of the US in August 1890. Good Americans, eh?