Can you identify this insect for me?
Definitely a nymph of some species of true bug (order Hemiptera), most likely in the suborder Heteroptera (i.e., the shield bugs, stink bugs, assassin bugs, etc.) and family Pentatomidae.

For example, see these photos of nymphs of similar species:

     

 From L->R: Podisus maculiventris, Troilus luridus, Glaucias amyoti, Cosmopepla lintneriana, Carpocoris purpureipennis, Murgantia histrionica 

Using yet another species, Piezodorus lituratus, as an example, you can see how a Pentatomidae nymph typically develops to maturity:



 Source 

As to your species...

This site lists Cosmopepla lintneriana, Chinavia hilaris, Podisus placidus, Chlorochroa rossiana, and Sehirus cinctus as species of Pentatomidae that live in Utah. None of their nymphs looks quite right, though your specimen reminds me most of a stripe-less Podisus. That might be a good jumping off place for further digging...  


As you can see, there are many species with similar nymphs, and various instars within species even have fairly great variation. 


I can't find a great match yet, but I can keep looking. I'll update if I find one.