Whilst at first sight a comparison chart in black and white may seem a little odd, it is born from the fact that many people are confused by immature male Bluets not yet being blue but rather being either beige or grey-ish in colour. The black patterning is, however, formed and identifiable. This chart encourages concentration on that.
Again, this is males only.
Click on this diagram if you need to open a larger version.
