User blog comment:Lord Loss/Monster Hunter Frontier Season Forward 5/@comment-5963861-20130303080026/@comment-969093-20130303104458

Seeing as the japanese refer to them as Volganos Silver Species and Volganos Gold Species individually I suppose they will get their own page.

ヴォルガノス【銀種】 & ヴォルガノス【金種】

The items you get from them however use either White/Yellow, Silver/Gold or both of those color-metals in their names.