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Mr. Cahill and the Sulphurs

I read a paper by Edmunds & Traver on fly mechanics. As the elevation goes up so does wing and tail size. every 100 ft the air get thinner and flight more difficult. This why a description will say;

Body 9 mm, wing 10.5 - 11.5.

The tails become even bigger in the male because the tails act as rudders in the air to stabilize flight in copulation. In order to hit the wing size at the largest you have to go to the max altitude range for the species. A carolina collected in NC high up has a wing size of 12 mm, in my area at 300 ft above sea level my wings are 10.5 for carolina.

Yours is darker that other carolina because of the substraight coloration. A friend photographed a carolina for me in south Carolina and it is much lighter. The substraight was also very pale yellow sandy like and from a lake.

They are two different bugs the eye spacing is way different + many other things. And they are both in the spinner stage.

View attachment 11022 this one is the Maccaffertium pudicum


View attachment 11023this one is Stenacron carolina


I'm dense, so I'm not quite getting your point.
The Carolina is the LIGHT one.
Or are you saying the darker one is a Carolina, too?
Both these bugs came from the same place with the same substrate...

As for tail length, why wouldn't elevation/air density affect the tail length of ALL the mayflies I see here?

Thanks for your continued input.
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