Threats posed by non-indigenous invasive insects to native ecosystems are well documented. However, little is known about the potential impact to native ecosystems by indigenous exotic insects (i.e., native species introduced into areas where they were not previously found). In northern Minnesota, repeated commercial shipping of barked whole western larch logs from Montana has provided a pathway for the intra-continental movement of forest insects. Dendroctonus pseudotsugae Hopkins has been trapped in pheromone-baited funnel traps in northern Minnesota over a 3-year period, and we hypothesize that this indigenous exotic insect has become established in Minnesota and originated from the western larch logs brought into this area. We conducted a large-scale host selection study, using D. pseudotsugae pheromone-baited Douglas-fir and tamarack logs, to determine whether D. pseudotsugae would colonize and develop in a new host (tamarack) in northern Minnesota. Forty-four percent of Douglas-fir and 36% of tamarack logs baited with D. pseudotsugae pheromones came under attack by bark beetles. Currently, we are awaiting brood development to determine if D. pseudotsugae is present in the baited logs. If either D. pseudotsugae or the native D. simplex LeConte are present in the Douglas-fir and tamarack logs, we will compare attack density, number of successful and unsuccessful galleries, brood production, and adult lipid levels of the beetle species in the host logs.