Yak bug

Chromer

Defeat terrorism
#1
March 9 2008

Every 3rd rock has 4 of these guys under it. This bug was kept in the boat - within 1 hour it had molted out and sprung wings!



A couple were seen flying around the walking bridge too - nowhere near clielm.
 

cabezon

Sculpin Enterprises
#2
Hi Chromer,

Those look like Skwalas. The males cannot fly. They wait under cover near the waters edge during the day. They come out from under cover at night (see www.washingtonflyfishing.com/gallery/showphoto.php?photo=12889&ppuser=3541) as new females emerge and pass along their genetic material (see www.washingtonflyfishing.com/gallery/showphoto.php?photo=12887&ppuser=3541). It can be quite a mob scene with several males trying to succeed with a single female. The flying versions would be slightly larger females.

Steve
 

Taxon

Moderator
Staff member
#4
Chromer-

Your photo is of a Skwala, either S. americana or S. curvata, not sure which, and it is right on schedule. They are a member of family Perlodidae (Patterned Stoneflies), and commonly referred to as Skwalas, Medium Brown Stones, Spring Stones, etc.
 

Nolan

New Member
#6
I was on the Yak in Cle Elum on Saturday and saw the black versions size 10-12 and smaller ones size 16-18. There were certainly few and far between. I saw 2 of the large version and about 40 of the smaller ones.