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I have been trying to identify Helinas from photos (not caught) for a long time. Though difficult, the only characteristic I am not sure about any more is the "Radio cubital node". The keys from "Mikes Insect Keys" requires looking for "small setulae on the underside"; A Couple of questions about this:

1. I really could not find the exact location of the "Radio cubital node". Would someone help me in the right direction? (for example, on https://www.flickr.com/photos/63075200@N07/52307254220/).
2. How small are they? Obviously, without catching the specimen, most of the time I cannot make pictures from under the wing. Would pictures from the side/top also show the setulae? (Related to the first point, but I always thought it was this big setulae on https://www.flickr.com/photos/63075200@N07/52307237909).

Hopefully someone can point me in the right direction

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Below I have marked in red where they would be.

(I am afraid you really have to start catching them to identify them reliably.)

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Oh wow, that is a different location and much smaller than I thought So this is a node where the veins of R2+3 and R4+5 are coming together, right? Or is this the node where R1 and the Rs are coming together?





It does seem like that indeed… too bad.