---

These are Reichertella, most probably nigra. Vicinous species Reichertella pulicaria is very similar. Check the wing venation on specimens (as unfortunately not well visible on your picture): if the stem of fork M1M2 (the veins immediately below the anterior well-marked veins) is shorter than half length of the fork itself, then it is R. nigra, if longer then it would be R. pulicaria.