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

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.

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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Female Hesperophylax designatus (Limnephilidae) (Silver Striped Sedge) Caddisfly Adult from the Touchet River in Washington
JpMcKenzie's profile picture
Canada Québec

Posts: 2
JpMcKenzie on Dec 16, 2017December 16th, 2017, 4:12 am EST
Hey! How would you tell this is a female? thank you!
Jean-Philip, Mckenzie river Fly Fishing Lodge guide, Labrador.
Adventure & Entomology passionate!
Grants Pass, OR

Posts: 302
Creno on Dec 16, 2017December 16th, 2017, 11:35 am EST
probably cannot be sure from this pic only. If you could clearly see the palps, a male limnephilid has 3 palpal segments while the female has 5. I cannot see the palpal segments clearly in this specimen. Since Bob Newell took this pic it is likely he kept the specimen and could look at it with a microscope or other magnification. The females of Hesperophylax are easily separated to species based on their genitalia. Alot easier than the males.

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