Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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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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Black and Olive Duns
Like most common names,"Black and Olive Dun" can refer to more than one taxon. They're previewed below, along with 2 specimens. For more detail click through to the scientific names.
Mayfly Species Leptophlebia johnsoni
These are sometimes called Black and Olive Duns.
Mayfly Species Hexagenia atrocaudata
These are very rarely called Black and Olive Duns.
This species is slightly smaller than Hexagenia limbata and it occurs later in the year. It is only mentioned in passing by a few authors, but it can be locally important.
I found this lone Hexagenia atrocaudata dun fluttering by herself on the surface of a small, still stretch of river one evening as I paddled home from fishing for smallmouths in the warm August weather.
I found this spinner and a few of his friends bobbing above the river amidst a snowstorm hatch of white Ephoron flies.
See 1 more specimen...