Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.
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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.
I collected this female together with a male.
See 18 more specimens...
Mayfly Species Drunella walkeri
These are very rarely called Slate Drakes.
Ernest Schwiebert had this to say about the hatches of this chunky Eastern Drunella (Blue-Winged Olive) species:
See the Drunella and Drunella cornuta hatch pages for additional information.
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.
References
- Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.