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Carte-de-Visite, studio W.Reid in Ayr

Trooper, Ayrshire Yeomanry

The Ayrshire Yeomanry Cavalry was one of only two long-standing Scottish Yeomanry regiments.

While the officers sported a fully braided Hussar uniform, it appears troopers were fitted with the much simpler uniform shown here. 

The jacket is Army blue with gold lace and scarlet facings (cuffs and collar).
The "pillbox" forage cap is blue with a yellow band (note how orthochromatic film turns that colour into a flat dark tone)

William Reid is noted as operating his studio in Ayr from c.1867 to c.1878.

Thanks to Dave Knight for his help.