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Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Male Stenonema ithaca (Light Cahill) Mayfly Dun Pictures

Based on the identical size, shape, and relative proportions of different body parts, I'm pretty sure this dun is of the same species as two spinners I collected at about the same time. The color is dramatically different, but that's to be expected with many of these species in the transition from dun to spinner.

This mayfly was collected from the West Branch of the Delaware River in New York on June 7th, 2007 and added to Troutnut.com by Troutnut on June 8th, 2007.

Discussions of this Dun

12 replies
Posted by Dryfly on Jun 5, 2010
Last reply on Jun 11, 2010 by Wiflyfisher
Do Cahills ever come off in enough numbers for a rise to occur? Around here, they trickle off annoyingly, and never get much trout attention.I am wondering about this, cause I saw some spinners at a DQ last night. Are they ever real important?

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