Since I feel the need to be extra obscure (plus, just about everything else that comes to mind is rather taken), Warren ran a few stories about "The Gray Grasshopper" near the end of their run.
And neither probably quite counts, but there are at least two more Human Flies. One was a real-world stuntman who got a Marvel series adapting him as a quasi-super-agent kind of guy. The other was the "cover name" of the IW Blue Beetle reprints.
Plus a bunch of non-silver Scarabs, like Nedor's, the Fox Blue Beetle opponent, the Captain America serial villain. And I feel like there were a bunch of Roach-named characters once the Tick hit it big.
Oh, and the rather on-the-nose Bug-Eyed Bandit.
There'd also be a smattering of worms, too. Hey, if scorpions count (and if they do, I think it's AC's Scarlet and Timely's Silver, and I think a couple of others...including one from Harvey, no?)