Slate Drakes
Like most common names, "Slate Drake" can refer to more than one taxon. They're previewed below, along with 3 specimens. For more detail click through to the scientific names.
Mayfly Family Isonychiidae
These are often called Slate Drakes.
See Isonychia for details. It is the only North American genus in this family.
Isonychia bicolor (Mahogany Dun) Mayfly Nymph
View 7 PicturesThis Isonychia bicolor nymph from the Catskills displays the prominent white stripe sometimes characteristic of its species. This is the first such specimen I've photographed, because members of the same species in the Upper Midwest have a more subdued stripe (and were once thought to be a different species, Isonychia sadleri). The striking coloration on this eastern nymph is more appealing.
View 7 PicturesThis Isonychia bicolor nymph from the Catskills displays the prominent white stripe sometimes characteristic of its species. This is the first such specimen I've photographed, because members of the same species in the Upper Midwest have a more subdued stripe (and were once thought to be a different species, Isonychia sadleri). The striking coloration on this eastern nymph is more appealing.Region: Catskills
Collected Apr 19, 2006
Added Apr 21, 2006
Female Isonychia bicolor (Mahogany Dun) Mayfly Dun
View 13 Pictures
View 13 PicturesRegion: Upper Midwest
Collected Jun 14, 2005
Added May 26, 2006
Male Isonychia bicolor (Mahogany Dun) Mayfly Spinner
View 15 PicturesI got several really nice pictures of this spinner. I also collected a female on the same trip.
View 15 PicturesI got several really nice pictures of this spinner. I also collected a female on the same trip.Region: Northeast
Collected Aug 9, 2006
Added Aug 11, 2006
See 17 more specimens...
Mayfly Species Drunella walkeri
These are very rarely called Slate Drakes.
This is the second most common East-Midwest Drunella species, but it is not very important compared to Drunella lata. Ernest Schwiebert had this to say about their hatches:
An imitation is rarely required, but notes show that when it is needed it is needed badly.
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