If you've ever been driving down those back roads and seen some silly folks running around with nets, chances are they were entomologists. Netting is a very useful tool to look for bees that don't come to attractive traps. Given that bees are often small and super fast, you may see some netting high jinks alongside the roads so watch out!
I am a Postdoctoral Associate at CU-Boulder and have lead a number of projects studying patterns of native bee diversity in Colorado. Please enjoy your visit and contact me if you have any questions.