User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-3405141-20140728010841/@comment-25221591-20140728012135

That also has to do with the fact that the newer subspecies are more imaginative from a visual and gameplay perspective as well. A lot of the older subspecies were exactly what their name implied. Red Khezu is solid red, White Monoblos is solid white, etc. When you start getting colour palettes that can't be pinned down to a single colour, as with the newer subspecies, that's when they start giving them less basic titles. So as a result, I really doubt they'd ever change the names of the older subs simply because they were simple in more ways than just the names.