Here in Texas, the closest thing they have to matching the hatch is tying on an orange chenille fly to imitate cheetos falling into the water when the tubers are out in the summer. As a consequence, fly selection is pretty easy. My personal warm water choices are contained in a small, plain fly box that easily fits in a large pocket.
It contains the usual poppers, wooly buggers and terrestrials, but one fly is used more than any other. A white foam spider. This particular pattern is tied with foam, a chenille body, and rubber legs. The sheer simplicity of it is matched by its effectiveness.
I was introduced to this pattern by my friend Greg. Greg lives on the Guadalupe River just north of San Antonio, and had a lot of experience chasing various panfish and bass on that water. Taking an existing pattern and modifying it, he came up with this.
Two tips for tying it: first, cut the foam longer than you normally would for a fly of this type. Leave about a quarter inch or more hanging off the back of the hook. This way, when the really little guys try to take it, they will just bite the ass and pull it under water, saving you from having to bring them in and release them. An afternoon full of three inch bluegill really isn’t too much fun.
Second, leave a flap of foam over the eye of the hook. This will push water a lot better and create a bigger disturbance than if you left it flush. This particular pattern moves a lot of water and creates a lot of noise, particularly with those rubber legs wiggling. I’ve tried it with both four and eight legs, and they both seem to work equally well. Save yourself the time and keep it simple.
After much testing during all times of the year, white was determined to be the best color. Yellow and black also worked very well. A yellow chenille body with a black foam back is a good choice. Green, brown, tan, purple, and even blue spiders tied in this fashion will catch fish. 
The white spider is a warm water fly. But, I am tempted to try it for trout one of these days… It couldn’t hurt. Between the handful of people that have been using this pattern regularly down here it has accounted for hundreds of fish from palm size to arm length. Give it a shot and let me know how it works for you.
