2 volumes, large 8vo (251 x 178 mm). Half-titles; 107 nature-printed plates mounted on 56 leaves, with approximately 400 black and white illustrations throughout, some full-page. (Minor offsetting of tissue guards to plate mounts.) Contemporary green morocco gilt, spine in 6 compartments with 5 raised bands, 2 compartments gilt-lettered, rest gilt-ruled, turn-ins gilt, top edges gilt, others uncut (spines very slightly sunned). 

FIRST EDITION, LIMITED ISSUE, number 116 of 500 copies. The plates, referred to as "Nature Prints" are direct impressions of the wings from the actual insects, a laborious process. According to Denton: "I have had to make over fifty thousand of these transfers for the entire edition, not being able to get anyone to help me who would do the work as I desired it done...I will say, however, that there never a laborer more in love with his work" (Preface, p.vi).