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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Sep 15, 2016September 15th, 2016, 11:53 am EDT
This inquiry is directed mostly to the real entomologists on this forum or the skilled amateurs.

I have a little cabin along the WB of the Delaware River. The cabin is about 30 feet from the river. There are about four 130' tall pine trees on my property as well as a couple of large oaks and maples. There are lots of weeds growing along the bank.

There is a tiny black flying insect no bigger than a small fleck of black pepper that thrives on my property in such huge numbers that going outside on windless days is pretty much impossible unless you are wearing a head net or smoking a cigarette of cigar. Smoke does keep them at bay. Perspiration seems to draw them in. They seem to prefer flying around your head and for some unknown reason just love to fly into my ears.

If un-swatted they will bite and in a few minutes it is an itchy bump. Yesterday was quite wind free and quite warm. My wife had cut down some weed like shrubs and asked me to bundle up the cut-off branches. Hmm, within no more than five minutes there was at least 30 flying all around my head and driving me to the point of uttering all sorts of profanities until I finally gave up and ran into the cabin.

Do any of you fellows know what this biting insect might be?? It hovers around my wife and I and as soon as you stop slapping at them they will land and bite.

If I can't eradicate them is there a way I can either reduce their numbers or keep them off of us so we can sit outside and enjoy the river?

Edit: These flying insects are present from mid April until?? It is September 15 and they were present this morning when we left. I'm guessing they are around until the first frost. They are smaller than the "no-see-ums" and Black flies found in the Adirondacks, northern NH and much of ME. Could they be Simulium slossonae? Since they are so small I would think their life span is very short and there are multiple broods present throughout most of the year? Thanks.
Catskill fly fisher for fifty-five years.
Jmd123
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Oscoda, MI

Posts: 2474
Jmd123 on Sep 15, 2016September 15th, 2016, 12:06 pm EDT
No-see-ums!! Family Ceratopogonidae, often called "biting midges". Their larvae are very thin and almost straight, as opposed to true midge larvae (Chironomidae) which look like little white "C"s. I ran into these one night on the Rifle and kept looking for mosquitoes when my arms started itching. What the hell? Then I took a closer look and could see the little bastards...a spritz of DEET solved the problem, but not before I got bit up pretty good. No wonder they're called "no-see-ums"!

Jonathon

P.S. I haven't been running into any mosquitoes at all lately, one positive side of our summer drought.
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Sep 15, 2016September 15th, 2016, 12:19 pm EDT
We are experiencing a extended drought period with virtually no rain. When I am fishing they don't bother me. Yesterday morning I fished streamers from 7 - 9. I had not one insect buzz me while fishing. As soon as I stepped out of the water and up onto the grassy back there were a couple buzzing around my head.

I don't see any evidence of them on the main stem of the Delaware which is only about two miles from the cabin. Are the pine trees where the hoards are living>
Catskill fly fisher for fifty-five years.
Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Sep 19, 2016September 19th, 2016, 4:15 pm EDT
Thanks Jonathon. I was hoping Taxon would chime in with his sage thoughts on the topic.
Catskill fly fisher for fifty-five years.
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Sep 19, 2016September 19th, 2016, 7:12 pm EDT
Thanks Jonathon. I was hoping Taxon would chime in with his sage thoughts on the topic.


Hi Matt-

Although my guess would the same as Jonathan's, I tend to shy away from expressing opinions based on a verbal description, as my learning style is highly visual, so a decent macro photo presents me with all the challenge I need.

In any event, my only memorable personal experience with Biting Midges (no-see-ums) was perhaps 25 years ago while raking Dungeness Crabs from the exposed sandy tide flats of China Poot Bay across from Homer, AK. This preceded my having acquired much knowledge of aquatic entomology, but I certainly remember the bite of those vicious little suckers. :-)
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Sep 19, 2016September 19th, 2016, 7:38 pm EDT
I'll try and capture some specimens the next time I go up to the cabin. I have a pretty decent macro capability on my Sony camera. Maybe I will be able to get a couple of pictures.
Catskill fly fisher for fifty-five years.

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