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Sorry to come back on this, but I think I may have been right the first time. I found another male which looks similar and keys the same way. The cercal plate is again so different from H.fratercula in the book that I had yet another look at the 'brush' on the mid coxa. I think the fringe of setae on the anterior edge is not dense enough to be called a brush, though the bristles at the bottom of the katepisternum help to make it appear so from many angles.

This individual differs from the first in having stronger posterior setae around the middle of t3 (two on one side, one on the other, all a bit longer than the diameter of the tibia.

I add photos of the new specimen to show the terminalia and mid coxa (I amputated the leg to see better).