It's a bit difficult to see them, but I think that they are one of the stinkbugs. I'd say that they are a 'true bug', at least. I'll attach an image for you to compare, since you are the one who can see these little guys up close.

Here is a link that might be useful: {{!gwi}}

the caterpillar on the top is probably of some geometrid.

Thanks for the responses.
Rhizo - that attached pic is exactly what they looked like.