If you get to LA earlier on May 19th, you could catch one of the largest bug fair in the US at LA Natural History Museum.
http://www.nhm.org/site/activities-programs/bug-fair
They are about 2 - 2.5 cm and bulky.
I don't know if Atta texana could be found in NC Rick. Will check A. texana distribution in the US.
Becareful what you wish for Rebecca ;)
Don't be, no harm giving your thought and sharing information.
Here is another method for ID certain Empusa species, although it is easier by looking at the lobe.
Mantis will feed on any kind of insects in the wild so the only bad insects are those parasitic/pesticide infected insects. Diversify is the key. It is better to use a variety of feeder insects instead of one type of (good) insect.