The one on the right is a type of June beetle, but much larger than most of ours, and a plainer brown (not so red-brown), but with spots. It's about an inch long, and was on the kitchen storm door this morning. I think it's in the genus Phyllophaga. (Quick correction--the word back from the entomologist list is that it's a Grapevine Beetle, Pelidnota punctata.)
Beetles, according to my insect books, are the most diverse organisms on the planet--one in five of all living things (plants included) is a beetle. There are over 24,000 species of beetles in North America north of Mexico.