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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
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.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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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Coleoptera (Beetle) Insect Larva Pictures

Ruler view of a Coleoptera (Beetle) Insect Larva from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.
Ventral view of a Coleoptera (Beetle) Insect Larva from Mystery Creek #249 in Washington
Dorsal view of a Coleoptera (Beetle) Insect Larva from Mystery Creek #249 in Washington

This insect was collected from Mystery Creek #249 in Washington on July 25th, 2019 and added to Troutnut.com by Troutnut on July 27th, 2019.

Discussions of this Larva

Interesting
Posted by Martinlf on Sep 2, 2019
Last reply on Sep 2, 2019 by Martinlf
This is the first first photo of a beetle larva I've seen. Cool bug. Does anyone tie and fish a fly for beetle larvae?

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Coleoptera (Beetle) Insect Larva Pictures

Collection details
Location: Mystery Creek #249, Washington
Date: July 25th, 2019
Added to site: July 27th, 2019
Author: Troutnut
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