black beetle with yellow striations and red blotches, about 3/4 inch long. Found on a platycerium (staghorn fern). It did not seem to eat the fern or cause any damage. San Diego, California.
This is probably a leafhopper, Family Cicadellidae. More specifically it is one of the sharpshooters. It is probably a Glassy-winged sharpshooter, but some of the photo is not clear enough and would need other angles to be sure.
This leafhopper is found in eastern US and is especially found in the southern tier of states.
They feed on at least 73 species of herbaceous plants and have been found on sunflowers, hollyhock, okra, lambsquarters, cotton, corn,oak, ash, crapemyrtle, peaches, apricots, orange, magnolia as well as carrot wood.
They have piercing sucking mouthparts to suck the juices out of plant tissue. It has been known to transmit some diseases in southern California.