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The gray ones are in the order Poduromorpha (class Collembola) but I'm not sure of the ID past that. The orange ones look a lot like the species Vitronura giselae: http://bugguide.net/node/view/258732/bgp...
I agree that this is probably a bat fly. Because it looks like it has wings it's probably in the family Streblidae. Here's a link to an interesting Encyclopedia Britannica article on bat flies: http://m.eb.com/topic/55703
I think it's a weevil, maybe in the subfamily Brentinae. It looks a lot like this one, but I don't think it's the same species: bugguide.net/node/view/285658/bgpage
It looks like this could be a jumping spider in the Family Salticidae, but from this angle it's hard to tell for sure.
I think you're right about Uropygi and Thelyphonida. From what little information I could find, it looks like Thelyphonida is the new name for the Order, but Uropygi is still widely used, even in the scientific community.
Not a millipede, but a soil centipede. Centipedes have long antennae and only one pair of legs per body segment, while millipedes have short antennae and two pairs of legs per segment.
Nice photo! I don't think these are "true" fire ants though. I think these are actually weaver ants in the genus Oecophylla. Although these weaver ants are sometimes called fire ants, "real" fire ants belong to the genus Solenopsis. Compare these photos of weaver ants: http://en.m.wikipedia.org/wiki/Oecophyll...
to this photo of a Solenopsis fire ant: http://entnemdept.ufl.edu/creatures/urba...
I did some more searching and I'm not sure that this is O. disjunctus anymore. BugGuide indicates that there are about 500 species known from the Family Passalidae, most of which are found in the tropics. Sorry I can't help ID this guy past the family right now, but at least the common name applies to the whole family :)
Cool series! These aren't beetles, though. They are true bugs in the suborder Heteroptera.
Definitely a pseudoscorpion. They all look pretty much the same to me, but BugGuide says that there are 420 species in the US. You'd probably need an expert to ID it past the Order.
