Whitefly can turn into a major problem when they are allowed to multiply with no attempt at control. These insects hangout on the underside of the leaves as adults. That is also where they lay their eggs which hatch into the small, translucent disc shaped nymphs clearly visible on the leaves. Your control measures will require that you do something to get rid of all three stages: eggs, nymphs, and adults. Inside, use those sticky traps for adults, but change them occasionally. I never recommend them for the garden because they can catch too many other things like beneficial parasitoid wasps, butterflies, bees, tree frogs, spiders, and little lizards. I prefer a horticultural oil for the control of eggs and nymphs, but it must be applied directly to the underside of the leaves. Oils will smother the pests very effectively. Repeat the applications every week or so until you stop seeing the adults flitting around. Whiteflies are very mobile. Keep an eye on your other plants, too.

This? https://www.insectidentification.org/insect-description.php?identification=Orange-Assassin-Bug https://bugoftheweek.com/blog/2017/10/24/bugs-in-orange-and-black-three-assassins-milkweed-assassin-bug-izelus-longipesi-orange-assassin-bug-ipselliopus-barberii-and-wheel-bug-iarilus-cristatusi

...but it is a majority opinion. Even the casual insect hobbyist or butterfly watcher can tell the difference between the pictured skipper and the various sulphurs. The above image is overexposed; turning down the brightness in a photo editor reveals the tans and markings. The sulphurs have wingspans of over two inches and overall would be at least 5X the size of the above skipper. There are a couple of sulphur species that are tiny, but they do not occur in our region. The OP did not describe the flight of these insects (they are named after their flight habit), but he likely noticed that they darted and skipped around, unlike pierids (cabbage white, sulphurs, etc.) that fly noticeably slower and more erratically.

Too many look-alikes and not enough info for a single species ID. https://bugguide.net/node/view/526 ^ as suggested by tsugajunkie but note the nearly identical options https://bugguide.net/node/view/8443 ^ look-alike suggested by bugguide; is quite small (1/4") but is common enough to be called "picnic beetle" and can be found under bark. https://bugguide.net/node/view/32505 ^ Ken's suggestion; this is a much larger beetle, over 1/2", but the pattern is a little off and such a large beetle might not be found under bark. So without location and size info, hard to pin down.