Hi John - sorry this took so long to ID - they can be very difficult to separate from Powdered Flatwing if any of the diagnostic features are not clear or visible. Key details are the width of the humeral stripe and the shape and connectedness of the triangle/trapezoid on the side of the thorax; the shape and colour of the male's inferior anal appendages, and the number of cells in the discoidal field between the discoidal cell itself and the position of the sub-nodus. None of these are particularly clear in this image, but in aggregate they seem to fit, and so I have gone largely on the face colour and pattern which is entirely grey.
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