Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

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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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

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Ptilostomis?

Taju has attached this picture to aid in identification. The message is below.

Taju
Hartola, Finland

Posts: 11

Taju on Nov 15, 2008November 15th, 2008, 7:46 am EST

I guess that this is Ptilostomis, according to the web-pages. But what is the species name (ocellifera??)?

Jukka

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Nov 15, 2008November 15th, 2008, 7:54 am EST

Certainly looks like Ptilostomis, but I'm not sure I know how to distinguish the species. Wait for Dave on that score.

Creno
Grants Pass, OR

Posts: 302

Creno on Nov 15, 2008November 15th, 2008, 8:14 am EST

While the photo is not as good as the previous (the wing venation/coloration is not in focus) I don't believe it is ocellifera as as my specimens of ocellifera are generally paler and with less wing coloration than the other two likely species (postica and semifasciata). I would not feel comfortable using just size and color to separate these species. I think you need to take a good look at the private parts to be sure.

There is an excellent source for this family:

Wiggins, G.B. 1998. The caddisfly family Phryganeidae (Trichoptera. University of Toronto Press. 306pp.

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Nov 15, 2008November 15th, 2008, 10:18 am EST

Jukka,

Ethan Bright's website gives keys for Ptilostomis to the species level (based on the Wiggins reference that Creno mentions):

http://insects.ummz.lsa.umich.edu/~ethanbr/aim/Keys/Trichoptera/id_tom_phryganeidae_ptilostomis.html