An example of this is the Monarch and the Viceroy butterflies. A lot of BugClub members knew this one. It works like a strong perfume that they can smell. Ants and termites use pheromone trails to show others the way to food, water, or back to the colony. Fire flies use light to locate mates.
Butterflies use their coloring to attract mates and to warn predators to stay away.
Cicadas, grasshoppers and other insects use sound to find mates. They can actually tell each other where to find a food source. It is a grayish-brown color and it blends with the dry fields and grasses of it's habitat. It doesn't rub it's legs or wings together like a cricket. A tymbal is a membrane that can be vibrated to create sound.