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Not sure which Rivellia sp. this is, but there is one, R. melliginis, that is associated with black locust trees. This and several others, were at the south end of the old woods, close to a stand of black locust, so it is a good guess that they are R. melliginis. However, Bug Guide notes that this species and R. viridulans (which is more common) can only be told apart by dissection.