I have found no information about this species in angling literature, but one mediocre evening on the West Branch of the Delaware I found them to be a substantial part of the mixed bag of cahills and other mayflies causing a half-hearted rise of trout. Where & When
Regions:The Mayflies of the United States webpage shows this species distributed across the East and Midwest and West into the Rockies, although not quite to the Pacific slope.Hatching BehaviorTime Of Day (?): Evening
East, Midwest, WestTime Of Year (?):
My collections were on June 7th in the Catskills
Time Of Day: EveningI collected a male and female mating while flying downstream over the tail of a long flat, not in part of any concentrated swarm over a riffle. I saw many of the females flying over the water and dipping down to lay their eggs.
Pictures of 4 Mayfly Specimens in the Species Maccaffertium terminatum:
Male Maccaffertium terminatum Mayfly Spinner
View 11 PicturesI positively identified this specimen under a microscope with a good key. It was one of the more common species in a generally light mixed bag of mayflies over a big Catskill tailwater last night.
I swooped this one out of the air while it was mating with a female, so I can be certain about her ID as well.
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