Hi Michael, 

You have observed a lacewing larvae and a scarab beetle larvae. 

The lacewing larvae is the insect on the end of a stick feeding on another insect. Lacewing larvae are beneficial, feeding on a variety of smaller insects that are often pests. In your picture, it's feeding on a plant hopper, a sap-sucking insect that's a mild pest. But lacewings will feed on other more serious pests, like aphids.

The scarab beetle larvae may or may not be a pest, it depends. Larvae of beetles in this family are typically root feeders. They all look very similar, distinguished by the pattern of hairs on the tip of their abdomen (rastral pattern). This larvae could be one of our native species (whose damage is insignficant), or it could be japanese beetle larvae. But I would need to see the rastral pattern to know. 

Let me know if you have further questions.