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.
These are often called Slate Drakes.
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.
Collected April 19, 2006
from in Added to Troutnut.com by on April 21, 2006
These are very rarely called Slate Drakes.
had this to say about the hatches of this chunky Eastern Drunella
(Blue-Winged Olive) species:
An imitation is rarely required, but notes show that when it is needed it is needed badly.
See the Drunella
and Drunella cornuta
hatch pages for additional information.