Help with theses mayflies

[albud1962]

Saw hatches of theses two mayflies on the upper yellow breeches. Any idea what they are? One was a size 16 the other an 18.

https://www.dropbox.com/s/e21v70brf6q24d6/img_0010.jpg?dl=0
https://www.dropbox.com/s/o329gp1u082vakw/2015-08-05%2018.49.05.jpg?dl=0

https://www.dropbox.com/s/wcesczrr12sloeh/img_0011.jpg?dl=0

I apologize for the third photo the fly was small and the light conditions at 8:30 were getting poor.

 

[afishinado]

Cahill

 

[pcray1231]

2nd and 3rd pics aren't showing up for me. 1st is a cahill.

Most cahills are in the maccaffertium genus, not the stenacron genus that afishinado linked. That said, based on both appearance and timing I think this particular one may indeed be a stenacron interpunctatum.

 

[RCFetter]

pcray1231 wrote:

Most cahills are in the maccaffertium genus, not the stenacron genus that afishinado linked.

Maccaffertium genus is in the link near but the bottom of the page.

 

[albud1962]

https://www.dropbox.com/s/wcesczrr12sloeh/img_0011.jpg?dl=0

Does this work?

 

[pcray1231]

No, and that first one stopped working as well.

 

[LetortAngler]

The mayfly in pic #1-2 does not look to be in the size range of 16-18.
My guess for 1&2 would be Yellow Drake.

 

[albud1962]

Well pic one and two actually more a size 14. I always underestimate fly size and go with smaller hooks. Based on trout nut I think pic 3 is a female Cahill albeit a small one

 

[afishinado]

I believe your bug pics show some sort of fly commonly called a "Cahill" by many anglers. The bug shown is probably what many would called a "Steno", a common term on the D River for a Stenacron.

If you check out the entire series of pics in the troutnut link below, the most common bugs with the common name Cahill are listed, including the Maccaffertium genus,which is the newest name/classification used by entomologists and the most common genus with the generic name Cahill.

http://www.troutnut.com/common-name/76/Cahills



Yellow drakes are a large insect, like size 8 or 10 and also have three tails.

http://www.troutnut.com/common-name/210/Yellow-Drakes

I copied and pasted the 3 pics below for those having trouble viewing them:

 

[dryflyguy]

In his books, Charlie Meck used to refer to what he called a cream cahill. They hatch later in the season, and are more whitish in color. Instead of tan colored like the other cahills.
I've seen them quite often this time of year on many streams.

 

[troutbert]

The top two look to me like cream cahills.

The third one looks a little different. The body doesn't look so whitish, but more yellow/amber.

Probably also in the cahill family. I saw bugs that looked just like the third photo on Spring Creek last night. Looked to be about a #16. A few trout were rising.