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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.

Updates from July 27, 2011

Closeup insects by Bnewell from the Touchet River in Washington

Male Acentrella turbida (Tiny Blue-Winged Olive) Mayfly Spinner
I would not like to have to match this hatch. These are the smallest mayflies I have ever seen. I used to think Caenis was the smallest adult mayfly in the west but these guys are about 4mm long. The male eyes are two toned, brown above and olive below. The abdomen is dark brown interspersed with light brown. The abdomen is clear for the anterior 2/3rd and the remainder is white. The tails are twice as long as the insect. There is only one pair of wings.
Female Acentrella turbida (Tiny Blue-Winged Olive) Mayfly Spinner
Here is the female spinner of the tiny Acentrella turbida. You can see the coloration is quite different from the male.
Hydropsychidae  Caddisfly Adult
These specimens are either Cheumatopsyche or Hydropsyche. They escaped before I could catch them.I suspect, based on size, they are Hydropsyche, they are about 1/4 inch in length. Both H. occidentalis and H. californica are common in the Touchet River.
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