What an odd-looking creature I found on my desert milkweed flower this week. It is bright orange with striped legs. Look at the black spines on back end (abdomen). It also seems to have its straw-like beak piercing a black insect.
This insect is a young assassin bug, a stage called a nymph. If it were an adult, it would have wings.
Assassin bugs use their front legs to capture other insects for food. They stick their proboscis or beak into their victim and suck out the juices. In this case the nymph has caught a tiny parasitic wasp. The wasp was probably searching for aphids, which is what its larvae use for food.
Edit: I was able to find an adult to show in this later post.