Sorry. This is not I. anoka -- it's a female Plauditus dubius. I was thrown off by its size. As I noted this nymph is close to 5 mm; P. dubius nymphs tend to be smaller -- 3.0 - 3.5 mm. But two things are off: 1) the median caudal filament on I. anoka is longer than segment 10: it looks like this.
That is not true for the nymph that I found today. And 2) as noted in Beaty's description, there are "midventral dark spots ...present on abdominal sterna 2-8 or 9." These.
There are no such marks on the nymph that I found today. I can also note that the widening of the tibia from the base is more distinct on I. anoka than what we see on P. dubius. It should look like this:
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