Thanks Mack. :)
Most of my fly tying thread now comes from a small fly shop in the Northern Indianapolis area. I used UTC Ultra Thread (Flat-Waxed Nylon) 140 denier to tie these.
I do like to use 40-wt. trilobal polyester threads like Coats Machine Embroidery. Find them at fabric and craft stores like JoAnn or Hancock Fabrics.