Small, pale moths swarming in late October in aspen (Populus tremuloides) forest with wingless females.

http://entomology.museums.ualberta.ca/searching_species_details.php?fsn=spanworm&sb=1&r=5&o=1&c=2&s=3886&sn=Macaria+loricaria

http://entomology.museums.ualberta.ca/searching_species_results.php?fsn=spanworm&fts=

It seems Macaria loricaria is not recognized at this site for some reason. Name change?