Beneath the horizontal line are the following:
Now for the color differences: Berger clearly shows a brighter, more yellow Akialoa than Frohawk, and a somewhat more colorful and greener bird than that in the print from the Hawaiian Legacy Archive. A search of the internet provided only images of stuffed specimens, no color photo of a live bird. Based on several of these, it appears the colors Marian Berger used are most accurate.
The Akialoa is now thought extinct. For a while there was thought to be an additional species or sub-species which was called the Greater Akialoa, but it was later thought that there was just the one species, Akialoa.
What a beautiful bird; I would love to have seen one in the wild.