Here is the fly pattern sheet for the Emerger Ida May, developed by Charles Brooks.
Materials
Hook:
Tail:
Rib
Overrib:
Body:
Hackle:
Thread:
Size 10, 1XL, light wire
Very webby grizzly dyed dark green
Peacock herl
Fine gold wire
Furry Foam, beige, split or separated
Webby grizzly dyed dark green
6/0 black
The body calls for a strip of Furry Foam, which I show below. Use a green Pantene marker with a black marker over the top of green to color the tan Furry Foam body. This process makes a multi-color body.
Fly pattern from Charles Brooks’ book entitled The Henry’s Fork (1986) in Appendix C, page 201.