If you look on the bottom of leaves, you may find some tiny caterpillars. Do you know which species of Monarda you have? If you find a caterpillar (or whatever critter you find) & are able to share its' pic, someone might recognize it. Not really a question about nectar, might get the most answers if the question is in its' own discussion. A brief search led to info about various kinds of butterflies using various species of Monarda as host plant, or it could be the larvae of some kind of pest like armyworms, or completely different kind of plant muncher.
