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Peter Kirby was able to answer it:

"Nearly all the splodgy-winged Psyllopsis I've ever looked at, like yours, match figs 97, 98 and 99 in the key, so I assume these are fraxini, as the figure legends suggest and as the text describing it as common supports, and that the trouble is that in the first sentence of the key couplet the phrases "in basal third" and "at approximately mid-height" have been transposed. Accompanying females have certainly always matched the fraxini illustration. I was once going to follow this up and seek additional literature, but lost interest before doing so. The putative fraxini I've looked at include both the wing patterns illustrated, intermediates, and more extreme examples beyond both."