Observed on Dasiphora fruticosa.

Perhaps Dichelonyx backii(?), given that they are said to be subalpine, widespread, and often found on wild rose; Dasiphora fruticosa is in Rosaceae.

http://entomology.museums.ualberta.ca/searching_species_details.php?s=5422

http://entomology.museums.ualberta.ca/searching_specimen_results.php?fmo=&fmsn=dichelonyx&fmc=&fml=&fmd1=&fmd2=&fmh=