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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.

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their 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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Dorsal view of a Hydrophilidae (Giant Water Scavenger Beetle) Beetle Adult from the Namekagon River in Wisconsin
This is a water beetle. It is the hardest object in the world to pick up with tweezers. The second hardest is Mount Everest.
Posts: 34
DMM on Nov 18, 2006November 18th, 2006, 7:58 pm EST
Beetles can be very tricky to identify. It has been my experience that it is extremely difficult to identify many insects to the species level based on pictures alone. It may not be able to be positively identified to genus either. The family is probably correct though, except the family isn't listed here. The family should be Hydrophilidae. Hydrophiloidea is a superfamily designation. Having said that, GONZO's ID could be correct (and if he has the experience, probably is), it's just not possible for me to confirm this.
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Nov 20, 2006November 20th, 2006, 6:03 am EST
Hey DMM,

Thanks for all the IDs! I've shuffled all the specimens around the site now to fit your recommendations.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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