Marla Garrison's Damselflies of the Chicago Region
The book is not out yet, we don't think, but we can't wait to get our hands on it. Here is a downloadable pdf of Marla's Chicago Region damsels. It is outstanding! We're certain it will be helpful for most of the midwest. Great images. Great field notes. You are certain to find it helpful.
Common Dragonflies and Damselflies of the Chicago Region
When John & Jane Balaban aren't on-line at BugGuide, they are working for various Chicago-area environmental groups. For the Field Museum, they made this beautiful on-line guide that can be viewed or downloaded at the URL given here.
Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. If you need expert professional advice, contact your local extension office.