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I agreed and agree that it may be impossible to put species level name on this Pherbellia.
But I disagree with silvery frons as reliable character for Ph.argyra.
I just reexamined my good amount of collected Ph.argyra (this species is easily IDed by combination of plumose arista and bare hind margin of mesopleuron). Whittish (silverish) pruinose pattern on frons may be very weekly developed and being visible only from several angle of view. But fore 1/3 of frons is always light-yellowish in contrast with brownish hind part of frons.
Nikita