By David L. Wagner, Dale F. Schweitzer, J. Bolling Sullivan &Richard C. Reardon.
I'm not sure I can review this book adequately because it follows the same format as Caterpillars of Eastern North America: A Guide to Identification and Natural History (Princeton Field Guides) by David L. Wagner. Generally it opens with important information, anatomy, how to trap, how to identify, that sort of thing; then it turns into page after page of information to each species! Basically this is a scientific key in book format!
I highly recommend buying "Caterpillars of Eastern North America" first if you don't already have it. "Owlet Caterpillars of Eastern North America" is almost 600 pages long and devoted entirely to expanding upon the 117 page chapter in "Caterpillars of Eastern North America." Caterpillars is a smaller, more compact novel sized book while Owlets is large and more text book like. Both have excellent pictures in them for identifying, but Caterpillars certainly has the more colorful and exotic of the bunch. Most of the Owlets are plane looking, either green or brown in color, and turning into rather bland moths.
This isn't really a kind of book one reviews, but if I have time I might devote a post to it. Normally when I find something out in the garden I don't know I'll grab Caterpillars of Eastern North America and try to identify it to Family, then Genus, and Species if I can.