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Well, as you know there are more features that the formal ones mentioned in the official books. You know, the 'jizzy' features.
A clear jizzy feature of Phorocera grandis is that the head looks big, due to the enlarged and silvery parafacial. In female more so than in male.
Knowing this and the date, I have no doubt that this is Ph. grandis.
Ph. assilimis is long gone, by then.

Theo