Probably a Harlequin Bug.

Here is a link that might be useful: Harlequin Bug

I concur. In my garden, they tend to show up on crops in the brassica family and can do a lot of damage. I usually handpick and destroy them. Destroying them early in the season is the key to preventing a big population explosion. You've got to get them before they lay eggs everywhere. They prefer brassicas, but will move on then to asparagus, eggplants, tomatoes, etc.

For what it is worth, I never see more than a couple of them in an average year. Of course, nothing about this year seems average, does it?

I thought that was what it was but when I googled it didn't bring up the orange one. Sadly, I have a lot of them but I have not caught them on any food plant, just on that obnoxious vine that grows in my fence. I have had a lot of damage to Chinese cabbage, and to broccoli before I covered it up. I haven't looked at it for a few days, but I don't think it has any new damage. This is the first year I have seen this many and the first year I have had this much damage. I usually have flea beetles, Japanese beetles, and blister bugs as the worst pest. Sometimes I get regular squash bugs and one year I had borers.

My largest tomato plants are in containers and they are showing some damage also. I don't see any worms on them. The tomato plants in the garden that have the small holes in them are along the same fence where I am finding these bugs, but the holes in those leaves look like flea beetle holes.

It is certainly a pest-y year.