Actually, I've had a lot more than three "disappear". However, the three I mentioned were all IDed at Bug Guide, so I know they were in the computer here at one point. (Believe me, I don't know enough Greco-Roman nomeclature to make up names.)

It might have been accidentally frassed (I can't imagine anyone frassing it on purpose).

You might have posted it/had it IDed somewhere else and forgotten where you posted it- I notice you have it here

It was moved by its namesake into an evil, otherworldly dimension via the Bermuda Triangle... ;)

I know that's where unmatched socks go, and now it's sucking up my posts.

With beetles, I've had no IDs except at this site, though I did send one to another expert. I'm glad I have most of my best stuff at Peter's site, in case things continue to vanish here. I also remember getting the ID for this one, as I had another critter - turned out later mislabeled - identified with some equally neat name, then I refered to that fact in my comment to the post.

(None of the vanished items appeared frassable. One was actually unique; that I reposted. The third was insignificant, and I've already forgotten it.)

OTHO, Jim did find a misplaced darkling beetle I'd reposted. (Note that I had not included that in my three vanished images.)