I enjoyed the introductory pages. Every butterfly books chooses different things to emphasize in the introduction, and this book had interesting sections on 19th-century Canada/US butterly books and on butterfly wing markings that are visible under UV light.
The writing in the species accounts is also kind of fun, as in this comment on the Painted Lady: "Just like ladybugs, half of them are men."
Early stages are not illustrated -- just adults.
There are no range maps. Some accounts describe where the butterfly is found, while others do not.
The list of references and resources is quite short, which is perhaps reasonable if the book is aimed at the general reader. Louis Handfield's book 1999 book is mentioned, but not the second edition (2011). The TEA's 1991 "Ontario Butterfly Atlas" book is mentioned, but not the web-based Ontario Butterfly Atlas Online (available since 2011) or the web-based Maritimes Butterfly Atlas.
Maybe the photo on the cover is a Two-tailed Swallowtail, which is a western species not known from Ontario and Eastern Canada, but I will leave that for others to judge. The book does not say. It's a pretty photo, and I can see why it would be chosen for the cover.