The Drift Fence by Zane Grey

Two riders had come out of the woods. They were not cowboys, yet Jim could not in a glance determine why he made that distinction. Had it not been for Lonestar Holliday's announcement and its instant and singular effect upon his comrades, Jim would not have made anything unusual about a visit from strange riders. That had already happened. Nevertheless, as the former horseman halted, Jim modified this opinion.

The rider looked like an Indian, yet his skin was dark bronze instead of red. His features were shadowed by the brim of an old black sombrero, yet piercing eyes shone out of that obscurity. He wore a buckskin shirt, much the worse for long usage. The rest of his apparel corresponded with any cowboy's.