This months fly is the Loopwing Caddis Emerger. This pattern has no history that I can find. It was given to me to copy by a customer who raved about its fish catching ability. It is a fly that can look like a dun, emerger, or cripple on the water. It can be hard to see in the film, so can be used as a dropper connected to a bigger fly.
Hook - dry fly 14 - 18
Thread - tan
Tail (shuck) - tan sparkle yarn
Body & head - tan dubbing
Wing - tan sparkle yarn
The loop wing (Iris) caddis is a blue Ribbon Flies pattern:
https://www.blueribbonflies.com/iris-caddis.html