[IUFRO RG 7.03 FORENT] Northern records of scolytids

I am seeking information on northern-most scolytid records for a contribution to the Canadian Entomologist 2013 issue on the theme "Perspectives on Arctic Arthropods." I collected Trypophloeus striatulus Mann. from Salix alaxensis on the North Slope of Alaska at 67º 52' 08.? This is well beyond "tree line", which is on the South Slope of the Brooks Range. Lekander et al. (1977) show map locations (not coordinates) of several tree-infesting scolytids of Norway that approximate the latitude of the Alaska collection. Lekander, B., B. Bejer-Petersen, E. Kangas, and A. Bakke. 1977. The distribution of bark beetles in the Nordic countries. Acta Ent. Fenn. 32: 1-37 + maps. Do you know who might provide the collection data of the scolytids shown on the maps in this reference? Or, do you know of the latitude of any scolytid elsewhere that rivals or exceeds the Alaska collection? Malcolm Furniss Moscow, Idaho, USA