There's a new bug in my garden: it's very shiny, looks like a cross of black widow and aphid, is much larger than aphids, maybe 1/8+in. Young are shiny red. It is on my tomatoes, causing black spots, and on comfrey flowers. When I part the tomato leaves they hide or drop off quickly. I've been gardening many years and have never seen them before. Can't find any reference source. Ideas?
odd shiny black bug