Sawflies!

So first I spotted this cool black-and-red insect on a sorrelvine in the Meadow. Then I saw another one. And another one. Pretty soon, I realized what was happening! Some gal was ready to mate, and so were several males. Later, I learned that these insects are sawflies, specifically Ceratulus spectabilis. When I found yellowish larva on the same vine, at first I thought butterfly. Not! It's the larval stage of the same sawfly species! Aren't nature's puzzles so cool in how they fit together?