It looks like what you have is an egg cluster from the Assassin Bug or Zelus luridus. It is most commonly observed as the egg mass as the adults are more difficult to spot. It is associated with deciduous trees and shrubs and is common along the Front Range. The adults prey on other insects, rather than on vegetation. Follow this link to the CSU Fact Sheet for more information: http://wci.colostate.edu/Assets/pdf/CIIFactSheets/Zelus.luridus.pdf