Over the years, I have lamented the lack of a popular guide to Lepidoptera larvae. Aside from the classic Golden Guide to Butterflies and Moths (R.T. Mitchell and H. S. Zim, 1987. Golden Press, NY, 160 pp.), field guides have given scant attention to the larvae, illustrating only a few examples of common species.
O'Brien, Mark F.
"Caterpillars of Eastern Forests. David L. Wagner, Valerie Giles, Richard C. Reardon and Michael L. McManus. 1997. USDA Forest Service FHTET-96-34, 113 pp., soft cover.,"
The Great Lakes Entomologist, vol 30
Available at: https://scholar.valpo.edu/tgle/vol30/iss3/8