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The Specimen

Epeorus vitreus (Sulphur) Mayfly SpinnerEpeorus vitreus (Sulphur) Mayfly Spinner View 9 Pictures
Collected September 19, 2006 from Mystery Creek #43 in New York
Added to Troutnut.com by on October 4, 2006

The Discussion

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TroutnutOctober 4th, 2006, 5:03 pm
Administrator
Bellevue, WA

Posts: 2737		Most of this relatively large spinner's features make me think Maccaffertium but the fore tarsal ratio and the upward slant of the basal costal crossveins seem to fit Epeorus. Any thoughts? I'm guessing it's a late-season vitreus.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
GONZOOctober 5th, 2006, 12:51 pm
Site Editor
"Bear Swamp," PA

Posts: 1681		I'll second your call on this one. Some female "salmon spinners" of Stenacron look similar to this at first, but the dark crossveins usually give them away upon closer inspection.

Most of the female vitreus spinners I've seen have tails that are darker basally, but I don't think that's any reason to question the identity of this specimen. As far as I know, the only other Epeorus spinner with this coloration is albertae, and I think we can probably rule that out based on distribution.
GONZOOctober 5th, 2006, 11:05 pm
Site Editor
"Bear Swamp," PA

Posts: 1681		I was just flipping through some of my collecting notes while lounging in front of some late-night TV. One is from Aug. 8, 2003 on the Yellow Breeches, and I'll quote it verbatim:

"female spinner, 12mm, orange tergites w/ brown marks, orange head w/ pale green eyes, two tan tails, tan rear legs w/ brn. stripes on femurs, orange-brn. front legs w/ striped femurs, tannish orange thorax (lt. below), underbelly orange w/ crm. tip, wings hyaline w/ no dk. markings." Beside the note I wrote "vitreus."

Many anglers assume that vitreus is pretty much done after it peaks in June, but it tends to linger sporadically for quite some time, even in relatively warm streams like the Breeches. I have fished excellent hatches of vitreus in mid-September on the West Branch of the Delaware with the cold-water influence.

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