All the jargon is defined in an excellent glossary. With the fisherman in mind, the book also comes with a water repellant laminated field chart with the classification and identification of all the major groups (9 orders plus some non-insect bugs too!) Detailed illustrations are peppered throughout, by my bug-loving river partner, Christine Elder(http://www.christineelder.com/) , an accomplished entomological illustrator.
To make the very most of this book, you'd do well to have a magnifying glass handy, or even a microscope, since some of a bug's physical characteristics neccessary for identifying the critter down to the family level are best viewed magnified. But the books illustrations and photographs are so clear, that lack of one shouldn't pose much of a handicap. In my opinion, this book is a must-have for ultra-serious fly fisherman who really want to know their bugs. To learn more about the book and ordering visit: http://www.friendsofdeercreek.org/bugbook.html