Ant-like species seem unlikely to develop meaningful interstellar travel. To advance to the level of research and resource processing likely required to reach Earth, or even just communicate with other species seems like it would’ve developed commerce at some point, even if it’s a utopian collectivist society, they need some sort of resource allocation methodology and would need to agree to focus finite resources on free developing the kind of tech necessary for interstellar travel.

I mean yeah, interstellar bugs might be a thing but contact with them would be far less exciting than contact with a truly intelligent spacefaring race.