The Unequal Cellophane Bee (Colletes inaequalis). A telltale sign of unequal cellophane bees' presence is the appearance of groups of thumbtack-sized holes in bare areas of leaf-littered or grassy slopes. The holes are the entrances to the bees' nests. The holes typically are surrounded by small mounds of dirt -- this is soil excavated by female bees as they busy themselves digging tunnels in which to build their brood cells.