I went back a few hours later to check out the situation, could not see any of the bugs. Strange how they all gathered on one tomato.

Sounds like Colorado Potato Beetle larvae, and if it is they are very bad critters. They can eat that plant down quickly. Pick them off and smash them or put them in a cup with alcohol or nail polish remover. Bt does a number on them and not a bad thing to have around.

Awww, no sock hops in your garden Lucille? Better change the records in the jukebox. :)

First thing I thought of given the color was squash bug nymphs but I don't think I have ever seen them on the tomato plants unless the squash was right next to them. Just a guess.

Dave