Observation notes: Found in the morning inside my light trap.
My suggested ID based on: https://mothphotographersgroup.msstate.edu/species.php?hodges=10473 & https://bugguide.net/node/view/134890
According to Annotated Checklist of the Moths and Butterflies (Lepidoptera) of Canada and Alaska, Pohl et al. 2018, only two Stretchia species found in SK - S. plusiaeformis and S. muricina. S. plusiaeformis doen't remotely look like my specimen, whereas S. muricina matches very well.