This species is slightly smaller than Hexagenia limbata and it occurs later in the year. It is only mentioned in passing by a few authors, but it can be locally important. Where & When
» Species atrocaudata (Late Hex)
Regions:I have heard rumors of fishable hatches of this species in both Wisconsin and the Catskills. The duns and spinners have been a common sight for me on several Wisconsin rivers during August, but they have been too sparse to cause good rises.
East, MidwestTime Of Year (?):
July and August
I have had some luck with an imitation. Last year a very nice smallmouth bass rose to my atrocaudata spinner pattern as subtly as any trout.
Pictures of 3 Mayfly Specimens in the Species Hexagenia atrocaudata:
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