I dunno their names -- but they're both butterflies. :-)

Good rule of thumb: butterflies sit with their wings clasped together. Moths sit with their wings laid flat, parallel to the surface they're resting on.

Very pretty pics!

The Yellow one is a clouded sulfur I think. I'm not sure on the blue one, Good Luck in your ID attempts.

Very nice pics. :-)

The first is S. melius(gray hairstreak) and the second is P. sennae(cloudless sulphur).

WOW! absolutely beautiful - thanks for brightening my morning!

Gorgeous pictures, Regina!!!

Thanks everyone. I had fun chasing these little guys around my garden!

OK, so knowing the name lets me do some research. Here's what I learned:

The larva of Strymon melinus (aka Gray Hairstreak) is also known as the cotton-square borer because it will become pesty in bean and cotton crops. In the garden the larvae can often be found on cultivated Hibiscus, though it appears the larvae are not picky in their food habits:

The larva of Phoebis sennae (aka Cloudless Sulphur) appears to feed almost exclusively on the Showy Partridge Pea, which likes our hard red clay soil here in TN. The butterflies may migrate to the deeper South late in the season. You can tell male from female - males are often solid yellow, with the two circular marks on the lower wing (both sexes have that) while the female is yellow to white and has a brown to black darker edge, and a mark on the upper wing (though I saw a few pics labeled "male" that had the mark on the upper wing.) Based on this description, I'm tempted to say the one I photographed is female... turtledon, what do you think?

See pics of Cloudless Sulphur larva, adult, and cocoon here.