Aurora made an ant, back in the day. It was about 4 to 6 inches long, when assembled, if I remember correctly. I'll have to look it up in Graham when I get home.
I'm not sure if it was ever brought again by any of Aurora's successors:
-Monogram, who bought most of the Aurora catalog, when Aurora went out of business (some of those kits are still in production today, in Revell-Monogram's catalog
-Polar Lights or Moebius, who re-issued some of the old Aurora models, eg, the movie monsters, as well as adding new subjects in similar style.
I just ran a quick search on eBay for "aurora model kits":
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=aurora+model+kit&_sacat=See-All-Categories
I went a couple of pages in, but didn't see the kit I'm thinking of, but it could be several pages in.
If I find more info in Graham's book, I'll post it back here.
Best regards,
Brad