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> > Timpanoga hecuba

Leskorcala has attached these 4 pictures to aid in identification. The message is below.
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LeskorcalaSeptember 10th, 2020, 9:16 pm
Posts: 16This is largest mayfly of the Late summer / fall season on the Montana waters. On my home river Bitterroot river this big fall drake mayfly hatches during the day. They are big size 10-12 hook size and floating long ways on the surface before wild trout switch from sipping PMD or BWO and take this big dun.
MartinlfSeptember 13th, 2020, 11:52 am
Palmyra PA

Posts: 3078
Cool photos. Thanks for posting!
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
TroutnutSeptember 14th, 2020, 11:31 am
Bellevue, WA

Posts: 2689
Nice photos Les!

I still haven't had any luck finding hecuba adults to photograph myself... never quite in the right time/place. I do have a nymph on here, which I collected in late August on the Bitterroot a couple years ago.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
LeskorcalaSeptember 23rd, 2020, 9:24 pm
Posts: 16Thank you Martin and Jason,
Living by the river allows me to find them. I am just about everyday by the water and noticed that hecuba adults do drift in afternoon hrs and mostly on cloudy, cooler and even rainy days. All my samplings are from the Bitterrot river. I need to collect few nymphs. If you need any reference of the adult i have many of them.

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