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Philly

Mayfly ID

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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?

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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.

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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?

IMG-20220527-080904-01.jpg

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IMG-20220527-080857-01.jpg

 

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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

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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.

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

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Big guy on the deck this AM:

IMG-20220604-071149-01.jpg

Mahogany dun - Isonychia bicolor

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