They crawl up walls, they hide in cracks, they flip, they fly, and sometimes . . . crrrash. Beetles come in all shapes and sizes, and they are everywhere in this thoroughly buggy, beautifully designed book.      There are striped beetles, spotted beetles, all-over-dotted beetles--and don't forget the noisily gnawing beetles! Whether you love bugs or whether the sight of them makes you itch, you'll adore this infested offering from the beloved Denise Fleming.