Hendrickson Biot Comparadun
Hook: Gamakatsu S-10 #14 or Tiemco 100 #14
Thread: Unithread 6/0 Tan
Tail: Dun Microfibetts (tied in pairs on each side for flies #16 & up)
Body: Hareline turkey biot quills Hendrickson color
Thorax: Beck's Pinkish Tan
Wing: Hareline Medium Coastal Deer
Hatches on almost every Eastern trout stream. Here in NJ they come off in early to mid April and in the Catskills maybe later April to very early May.
I tie my biot body in and wrap normally, then I wrap thread back over the body, three wraps covers the whole body, just to reinforce it and the thread is barely noticeable but the extra strength will pay off on the stream because the biots are very weak.
After tying these I also found a technique that's been working well for me. In a Paul Weamer article
Tying a Better Compara-dun
He talks about how his good friend and Catskills legend, the late Jimmy Charron, tied his comparaduns. So now I've been tying in the wing with the tips pointing back and then propping it up from behind, this way when the wing begins to lean it leans back like a real mayfly and not forwards unnaturally.