I found this bug on an egg plant leaf outside late last night it is approx 1 1/2 in long and 1/2 in thick we put it into a clear container with a small worm/caterpillar and this morning we watched it suck it dry. it looks like a giant stink bug with a snout like a butterfly for sucking and horned back.
(ed. note: The only way we were able to access these images was to rephotograph them from our computer screen, so the quality is poor.
You have a Wheel Bug, Arilus cristatus, a member of the Assasin Bug Family Reduviidae. These large true bugs can be recognized by the cog like wheel on their backs. They are friends of gardeners since they eagerly feed on many garden pests, like the caterpillar you put in the jar. Those sucking mouthparts can deliver a painful bite if the bug is carelessly handled.