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3. Coffin Fly Spinner

Is the Coffin fly the male spinner of the Green Drake or does the Brown Drake also produce a white spinner?

The Coffin Fly and Green Drake are different names for the same thing in the East. The Brown Drake is another species.

My understanding is that the Coffin Fly is the male spinner of the Green Drake and it is white when spent. Does the Eastern Brown Drake (different species) also have a white male spinner?? Can you have both species, Green and Brown, come off in the same waters (eastern spring creek) at the same time? The reason I ask is it appears that I have seen both on the water. Any really good way to distinguish these 2 species from each other besides the slight green color to the wings (green drake)?
Thanks, Ed

I can't say for out East, but I have never seen a Brown Drake spinner that looked like the Eastern Coffin Fly (Green Drake) in the Upper Midwest.

No, but it is only the abdomen of the Green Drake spinner that is whitish. The wings of the spinners retain the heavy blackish markings, and the thorax is dark. It is the funereal black-and-white coloration of the male spinners that led to the nickname, Coffin Flies. (The female spinners often have a yellowish tint to the abdomen due to underlying eggs.)

Yes, when they are present in the same waters, the emergence usually overlaps. However, March Browns (M. vicarium) are sometimes confused for Brown Drakes and vice versa. Look at the number of tails: March Browns will have two; Brown and Green Drakes will have three.

Despite the name, not all populations of Green Drakes have a greenish tint. Green Drakes (E. guttulata) are typically larger than Brown Drakes (E. simulans). (Hatches gives the size range for Green Drakes as 18-30mm and Brown Drakes as 13-16mm, but I have seen female Brown Drakes up to 20mm.) Green Drake duns have creamy pale tan to dull yellowish abdomens with a darker brownish (sometimes dark olive) dorsal coloration. The wings are heavily marked with black or dark brown with a slightly yellowish (sometimes greenish) background. Brown Drake duns have tan or yellowish brown abdomens with dark brown patterning on the dorsal surface. The wings typically have dark brown markings on a grayish or yellowish tan background. Green Drakes lose the dark dorsal coloration upon transformation to spinners, but Brown Drakes retain the dark dorsal patterns in the spinner stage. (If you use the site search function to compare the photos of Ephemera guttulata to the photos of Ephemera simulans found on this site, the differences should become fairly obvious.)

Great info Gonzo! Thanks for the help. Jackson

I had very good luck with a pattern on the Delaware that uses a white foam post for the abdomen. It floats like a charm. Now to tie up some nuclear versions.