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 one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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Dark Grannoms
Like most common names,"Dark Grannom" can refer to more than one taxon. For more detail click through to the scientific names.
Caddisfly Species Brachycentrus numerosus
These are often called Dark Grannoms.
In Caddisflies, Gary LaFontaine attributed the famous spring hatch on the Beaverkill (now known as the "Apple Caddis") to this species. After that publication, entomologists described that major hatch as a new species -- Brachycentrus appalachia.
Brachycentrus numerosus is probably still important in many locations.
Brachycentrus numerosus is probably still important in many locations.
Caddisfly Species Brachycentrus lateralis
These are sometimes called Dark Grannoms.
Gary LaFontaine describes this as a "sister species" of Brachycentrus numerosus. It is similar in most respects except that it emerges a couple weeks later.
Caddisfly Species Brachycentrus nigrosoma
These are sometimes called Dark Grannoms.
This is a smaller, darker cousin of Brachycentrus numerosus.
References
- LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.