Pest control in Missouri follows moisture and a long warm season. Termites work wood that touches damp soil, especially in the south and in crawl spaces. Ants trail from wet mulch after hard rain. Mosquitoes rise where river storms leave standing water. Mice move inside when the heat starts. Roaches use damp kitchens in older city buildings. What you saw, and whether wings were attached, matters more than a guess.
Mud tubes, frass like sawdust, and soft sill plates are a different report from droppings in a drawer. Say which. Carpenter ants in wet fascia mean the board is already soft. A treatment on the counter does not dry a crawl space. Ticks in Ozark brush are a yard fact as much as an indoor one. Raccoons and squirrels use soffits opened by wind. If a storm made the hole, say the hole is new.
City brick and a rural crawl space do not share an entry map. Rim joists, garage sweeps, dryer vents, and gaps at grade are the usual doors. A return after you plugged one hole means another opening. Pets and children share the rooms, so say that before baits. Moisture is part of the complaint. A wet basement after a river rain will keep pests even when the kitchen is clean.
Tell the call what the building is: crawl space, basement, slab, brick multi-family. Night attic noise and daytime kitchen insects are separate facts. Do not seal every vent and trap the damp this climate already produces. If activity is only in an outbuilding, say so. Season matters: spring swarmers versus a fall mouse invasion. A neighbor's story about termites is not an identification.
Lead with what you found and where. Say whether the soil against the house stays wet. Missouri damp will keep the pressure on. Call the number on this page.