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Tsali has attached these 3 pictures to aid in identification. The message is below.
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TsaliJune 14th, 2015, 11:59 pm
Posts: 4Good evening,

Iím working on an identification for a Perlid and something that has me perplexed is the cross vein in the right forewing anal region but doesnít exist in the left forewing? Iím sure itís something Iím overlooking. Thanks in advance.

TaxonJune 15th, 2015, 4:21 am
Site Editor
Royse City, TX

Posts: 1350

Cross veins are much less consistently located than longitudinal veins. As I recall, Dr. McCafferty shared that information with me well over a decade ago, and in response to a question very similar to yours. :-)
Best regards,
Roger Rohrbeck
TsaliJune 15th, 2015, 8:11 am
Posts: 4Thanks for the quick reply. If following Merritt and Cummins would you consider the forewings to have no crossveins then? If with one or more crossveins the couplet takes you to Hansonoperla or Perlinella but the diagnostics for these don't seem to fit.

Feathers5June 15th, 2015, 9:26 am
Posts: 287That looks like a sulfur to me.
TaxonJune 15th, 2015, 11:25 am
Site Editor
Royse City, TX

Posts: 1350

I would need some context in order to offer any help regarding genus level identification. In which state or province was this specimen collected, and on what date?
Best regards,
Roger Rohrbeck
TsaliJune 15th, 2015, 8:28 pm
Posts: 4Ignoring the cross vein I keyed this out as Acroneuria but I'm questioning this one for some reason. Body length is 25mm and wing length is 28mm. Specimen was collected in East Tennessee in the Hiwassee River in June. I've attached a couple of dorsal and ventral images to the original post.

MillcreekJune 15th, 2015, 9:53 pm
Healdsburg, CA

Posts: 356

Looks like Acroneuria to me. Here are a couple of sites that show pictures.
TsaliJune 17th, 2015, 8:44 am
Posts: 4Mark - Thanks for the response.

Roger - Was that enough info? I suppose I should have provided better pics of the key diagnostic parts.

TaxonJune 17th, 2015, 12:30 pm
Site Editor
Royse City, TX

Posts: 1350

Roger - Was that enough info?

Sorry for the delay in responding. I also share your and Mark's belief that it's Acroneuria, for which the following species are present in Tennessee:

Acroneuria abnormis (Common Stone)
Acroneuria arida (Elegant Stone)
Acroneuria carolinensis (Carolina Stone)
Acroneuria covelli (no common name)
Acroneuria evoluta (Constricted Stone)
Acroneuria filicis (Illinois Stone)
Acroneuria frisoni (Central Stone)
Acroneuria lycorias (Boreal Stone)
Acroneuria perplexa (Enigmatic Stone)
Acroneuria petersi (Etowah Stone)
Best regards,
Roger Rohrbeck
OldredbarnJune 17th, 2015, 1:50 pm
Novi, MI

Posts: 2608
Acroneuria perplexa (Enigmatic Stone)

That is a great name for a bug! "perplexa".

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood

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