Although rather old, and long out of print, a useful book for identification of USA mantids is How to know Grasshoppers, Cockroaches and their Allies by Jacques Helfer (1953).
A number of Mantis Study Group Newsletters contain articles on mantids in the USA. See the following (volume:pages) 8:5, 8:8, 9:2, 10:5, 12:4, 15:4, 19:1, 24/25:1. The newsletters can be downloaded as pdf files from the MSG Newsletter download page .
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