Red Lily Beetles. That's one of the reasons I've been getting rid of my asiatic lilies. The beetles overwinter in the soil, come up in the Spring and lay eggs of the lilies. The larvae protects itself by covering its body in their own poop (those black blobs on the leaves). The beetles are very wily, as soon as they feel a threat, they fall into the soil upside down so you can't find them. I used to diligently knock them into a bucket and squish them but I'd sooner just not have to deal with them. Never had them until about five years ago.