I serendipitously discovered this little gem while checking out the online Field Guide to the Syrphidae of Ontario
. Always looking for more caterpillar references, I went looking for a copy and found it for sale at Kettle Creek Conservation Authority
. I paid US$12 with a credit card over the phone and it arrived today.
It's a small book but packed with lots of information. It aims to cover the easily identified caterpillars of Southern Ontario. With that in mind, you won't find any range information and the seasons are surely specific to that region. Nonetheless, I recognize most of the species from my own area here in Georgia, so it certainly has value as an identification aid.