Yeah, in the book they had ships. It's been a while, but I think they were missile based. Their space fleet was similar to their ground forces in that one human ship could take one bug ship, but there was never just one. Still, I always got the impression that the difference was smaller in space, but that the bug numerical advantage wasn't as big either. Of course, I could be entirely wrong about that.
If anyone has only seen the movie, you should take a look at the book just to see how incredibly different they are. For one thing, the bugs in the book had guns, not to mention the awesomeness that was powered armor.