What kind are these?

Tina Krenz
by Tina Krenz
I just spotted these three caterpillars on my long stem flowers this morning and don't know what kind they are or if they will harm my plants or not. They have little like horns at one end from what I can see. I hope someone can identify them and let me know. I don't want them to kill my plants that I worked so hard to save all summer in this Oklahoma weather and soil conditions that I had to condition just to make right. Thanks.
These are the ones I'm asking about. They have a ( what I call a horn) on one end. You can see it better when you click on the picture.
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