Mayfly ID

[Philly 0]

I found this mayfly on the window screen of my cabin when I was up in NE Ontario the first week of September.  It about a size 12.  Any idea of what kind it is?

[niveker 0]

Mahogany dun - Isonychia bicolor, would be my guess

 

[redietz 0]

On 9/22/2021 at 8:34 PM, niveker said:

Mahogany dun - Isonychia bicolor, would be my guess

 

Concur, especially if I'm seeing correctly that the four rear legs are light and the two in front are dark.

[niveker 0]

Found this guy on the screen door this morning.  One tail broke off during the struggle to get him poised, @ half inch long body.  Lovely caramel color. 

Any guesses?

 

[skeet3t 0]

They are bugs.

[utyer 0]

Ephemerella invaria, rotunda, dorothea or infreques.  All are "orange",  and rotunda comes closest to a half inch at 9 to 10.5 mm.  This is just a guess based on information from my old copy of Hatches. 

[SilverCreek 0]

This time of year it is probably a mayfly with the common name of a "Sulphur"

http://www.troutnut.com/hatch/11/Mayfly-Ephemerella-invaria-Sulphur-Dun

https://www.wiflyfisher.com/sulphur-mayfly-hatch.asp

https://www.google.com/search?q=sulphur+mayfly&tbm=isch&chips=q:sulphur+mayfly,g_1:dun:V-OXVu0cAbU%3D&hl=en&sa=X&ved=2ahUKEwjOsrec6__3AhWGkWoFHTe0DiMQ4lYoBHoECAEQJg&biw=1543&bih=1302

 

[niveker 0]

Ephemerella invaria

@utyer, @SilverCreek - thank you gentlemen. 

[redietz 0]

7 hours ago, utyer said:

Ephemerella invaria, rotunda, dorothea or infreques.  All are "orange",  and rotunda comes closest to a half inch at 9 to 10.5 mm.  This is just a guess based on information from my old copy of Hatches. 

Rotunda is no longer recognized as a species.  All supposed examples were shown to be either small invarias or large dorotheas.  The change was made in 2003.

[utyer 0]

As I said, my copy of Hatches is OLD,  published in 1975.  

[niveker 0]

Big guy on the deck this AM:

Mahogany dun - Isonychia bicolor

[niveker 0]

two sulfurs from this morning's walk, just shy of 1/2"

 

[Moshup 0]

On 5/27/2022 at 10:24 AM, niveker said:

Ephemerella invaria

@utyer, @SilverCreek - thank you gentlemen. 

Very cool Mayfly

[niveker 0]

Easy ID from this afternoon, large paper clip for reference

Color redition by my phone's camera sucks. 

[redietz 0]

6 hours ago, niveker said:

Color redition by my phone's camera sucks. 

Even with poor color rendition, the apparent lack of a hind wing makes it pretty obvious.