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Calloway has attached these 2 pictures to aid in identification. The message is below.
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CallowayJuly 24th, 2008, 12:09 pm
Asheville, NC

Posts: 5
Another Mayfly I need to have identified it was found in Fort Royal, VA.

Thanks for the help Guys
GONZOJuly 24th, 2008, 12:25 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
This appears to be a female Callibaetis spinner.
CallowayJuly 24th, 2008, 8:35 pm
Asheville, NC

Posts: 5
Could it be a cream cahill?
GONZOJuly 24th, 2008, 8:58 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Well, that would be a good imitation. The pale cross-veins and dark mottling along the leading edge of the wing are Callibaetis traits. The hindwings, although not apparent in the photo, would be quite small. On what is usually thought of as a "cream cahill" (Maccaffertium spp.), dark marking on the wings consists of dark cross-veins, the legs usually have some banding around the middle of the femur, and the hindwings would be larger. (Forewings and legs would probably appear proportionally larger as well.)

Callibaetis are usually more common around lakes and ponds, although some streams and rivers have small populations.

PS--You can compare your photo to this photo of a female Callibaetis that might be the same species:

http://bugguide.net/node/view/129515/bgimage
GONZOJuly 24th, 2008, 10:13 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Thanks for the additional image, Keith. You can see the sparse, pale cross-veins a bit better in the new photo (top). Notice that the hindwings are so small that they are not apparent in either photo.
PhillyfiredJuly 25th, 2008, 4:23 pm
Posts: 8Gonzo quick question what type of nymph/larva would you recommend to represent the PMD going to 3rd meadow of slough creek next week for 7days need to have everything possible. You have been a great help in learning
Thanks
Mark A. Pryor
Phila Fire Dept.
Trk 34
GONZOJuly 25th, 2008, 4:50 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Mark,

Something Pheasant-Tailish in #16-18 (I'd include some #20s just to be safe) is the usual prescription. Colors could range from light to dark brown, sometimes with either orangish or olive tones. Ephemerellid nymphs often show a fairly broad range of colors, even within the same population of the same species.

There are a few little ephemerellids that are referred to as PMDs, but Ephemerella dorothea infrequens (the former Ephemerella infrequens) and Ephemerella excrucians (the former Ephemerella inermis) are the usual suspects. I'm not sure about the timing of these on Slough Creek, but you are probably either in the overlap between them or perhaps favoring excrucians.

PS--I just checked my old 1980 Charlton guide. They don't get too scientific about the hatches, but they do mention the "Light Olive Dun" hatch on Slough Creek as a very important hatch from July 15th to September 1st. They might be referring to the excrucians hatch, but I'd include some "Light Olive Duns" in any event. :)
PhillyfiredJuly 25th, 2008, 8:38 pm
Posts: 8Lloyd thanks for the info, will have plenty to bring. Will keep you posted stayed tuned
See ya
Mark
PhillyfiredJuly 26th, 2008, 8:59 pm
Posts: 8Lloyd somewhere on this site i saw a pheasant-tail nymph right next to a PMD nymph (side by side) i would like to be able to look at them does such a picture exist??? could you help me out with this
Thanks
Mark A. Pryor
PFD
Trk 34
GONZOJuly 27th, 2008, 9:06 am
Site Editor
"Bear Swamp," PA

Posts: 1681
I don't recall that photo, Mark, perhaps someone else will. However, you can get a pretty good idea of what the nymphs look like by looking at the Eastern/Midwestern versions:

dorothea http://www.troutnut.com/specimen/766
excrucians http://www.troutnut.com/specimen/588

You can probably find hundreds of versions of the Pheasant Tail nymph on the web. It's hard to beat Sawyer's original, but many tiers don't like tying with copper wire. Or, you could just try this pattern/style:

Hook--#16-20
Tails--a few barred partridge fibers
Rib--fine gold wire
Abdomen/Thorax--rabbit/Antron dubbing blend in yellowish brown, olive brown or dark brown
Wingcase--black or dark brown poly yarn over thorax
Legs--a few barred partridge fibers on either side of thorax

You can weight this nymph with a copper wire underbody (or a bead, I suppose) or use unweighted for fishing in the film. I hope that helps.
PhillyfiredJuly 27th, 2008, 10:09 am
Posts: 8Lloyd
Thanks for the info
stayed tuned for end results of the 3rd meadow slough creek trip
Mark

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