Our horticulture curator at the zoo I work at found this beetle today. It died after he caught it and before I got it from him. My initial thought was Prionus, but the thorax doesn't look right. It looks pretty much identical to Ergates spiculatus to me and we have plenty of ponderosa and douglas fir here. I'd love to add a Colorado data point if someone can positive ID it. I still have the beetle, so can take different shots if needed.