2008, 430 pages, 15 color plates, 68 text figures. The text treats 169 species in 17 genera of North American moths of
several geometrid tribes. One genus, 22 species, and three subspecies are newly described. Adults of all species are
illustrated in color by 532 images and larvae of 81 species by 105 images. Diagnostic characters of all the genera
and species are detailed and illustrated.
Specimens of this large group of often similar and variable species have proved difficult to identify. Dr. Ferguson's
extensive field work in the United States and Canada and large number of rearings has enabled him to resolve many
problems of recognition and to discuss the means to accomplish it. Identification keys for all genera and many
species based on characters of adults together with illustrations of wings and genitalia and notes on variable
characters will be extremely helpful to enable recognition of specimens. The immature stages of 81 species are
characterized and illustrated. A synonymic check list of the described species updates the Check List of the
Lepidoptera of America North of Mexico.