A Hex is a bomber-size Mayfly, sometimes called a Green Drake, that shows up on Maine trout ponds in mid-summer, usually early July.

V. Paul Reynolds, Outdoors Columnist

For trout, they are a turkey dinner with all the fixins. To a trout-loving fly fisherman, a Hex hatch is both an adrenaline rush and a sight to behold.

So it is only fitting then that someone with a special love of trout angling, as well as a deep curiosity and infatuation with this iconic mayfly, finally rolled up his sleeves and wrote a book on the subject: “Fly Fishing the Hex Hatch,” by Leighton Wass. It’s published by North Country Press and retails for $24.95.

Wass grew up in Southwest Harbor, Maine. He taught high school biology in Vermont for 33 years. He is 80 and has been fly fishing since long before he was shaving. He fishes all the northern New England states but has a special place in his fishing heart for Maine. He lives in Adamant, Vermont.

The Hex mayfly is the star of Wass’s book, and he explains in patient detail and good humor all of the distinctions in a way that even I can understand. Insofar as I know, Wass is plowing new ground in a field populated with books about fly fishing tactics and insect identification.

This 310-page book, with its 250-plus photos and illustrations, is a must-read for experienced fly anglers and novices alike. Topics addressed include how to predict the timing of a Hex hatch, how to be prepared for an evening of fishing, the author’s top five Hex flies, the Hex mayfly’s life cycle, and the confusion surrounding common names. In addition, the 160 Hex ponds and lakes named in Maine, New Hampshire and Vermont are the most ever listed, and an index allows readers to pinpoint pages where specific bodies of water are discussed.

“Fly Fishing the Hex Hatch” has voice, humor, heart and a breeziness that I found engaging. It’s a comprehensive, instructive book and a fun read for the novice angler or the stream-seasoned veteran. Wass knows his stuff. His book is a winner.

Wass has been an outdoor freelance writer since the 1970s, but this is his first book which shares all the hows, whens and wheres that he has learned about this revered mayfly hatch. It will become a fly angler’s reference for years to come.

Signed copies are available directly from the author. Send $24 plus $4 postage to Leighton Wass, 1255 Adamant Rd., Adamant, VT 05640.

V. Paul Reynolds is editor of the Northwoods Sporting Journal. He is also a Maine guide and host of a weekly radio program, “Maine Outdoors,” heard at 7 p.m. Sundays on The Voice of Maine News-Talk Network. He has authored three books; online purchase information is available at www.maineoutdoorpublications.net.