I purchased a wonderful butterfly identifier wheel many years ago that I keep on my refrigerator. You can see that it also identifies each distinct caterpillar.
If you have time to watch it, I found a terrific video from PBS Central Texas Gardener on Butterfly Gardening. It is very inspirational. http://www.youtube.com/watch?v=YocWNkvUbYg
I noticed migrating Monarchs began coming through my yard on Sunday, October 6, 2013. Here is a link to a web site discussing their route to Mexico with a map showing their migration route.
Monarch on wild aster.
Sipping nectar on aster.
Swallowtail on Vitex. Check out the butterfly's body. The stripes match up with the wings. I had never noticed this before on a butterfly - I wonder if they are all this way regardless of the type of butterfly?
Note the 2 striped caterpillars on the most right flower in the photo below. I think they are webworms and are the caterpillar of a moth. I'll update the post when I confirm.
Outer wings of Gray Hairstreak on aster.
I usually see lots of Painted Ladies. This is one of 2 I have seen this year - worrisome.
Buckeye on aster.
Outside wings of a buckeye.
And finally I got a picture of an Alfalfa Butterfly, although the pictures are not the best.