Asked August 21, 2015, 12:03 PM EDT
DeKalb County Missouri
It is hard to see for sure but I believe it is a stink bug. It looks like it may be a green stink bug? The info from MU Extension is mainly for field crops. I found a link to some info from Mississippi State Extension on dealing with stink bugs in gardens-
To help with identification the University of Kentucky Extension has some good info- http://www.uky.edu/Ag/CritterFiles/casefile/insects/bugs/stinkbugs/stinkbugs.htm
Hopefully this helps you identify and deal with them.