I have been seeing these insect traps for years here in west central Arkansas and thought I would post a photo of one in case someone wonders what they are.
Note: Thomas Arbour contacted me with what I think is the answer to what these insects traps are for – Threat of the Gypsy Moth
I also found this info:
In order to determine the spread of Gypsy moth federal and state regulatory agencies conduct comprehensive Gypsy moth trapping programs. Delta or milk carton traps, which vary in color from green, orange, or brown are distributed within areas known to have Gypsy moth and at the leading edge of an infestation to track its spread. The traps are baited with a lure, which is a natural pheromone that attracts the male Gypsy moth. This provides a means to determine the potential infestation of an area and if a quarantine should be implemented.
I started another Blog to show some of the wildlife photos that are stuck away in my archives. Please visit my other blog if you get a chance. 
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There are so many insect pests out there, I really couldn’t guess what your is searching for in Arkansas. Here in Ohio, we have similar traps that are green that are used to capture non-native gypsy moths to determine their distribution.
Tom