The following table, adapted frorn Brunner von Wattenwyl and Stal, will enable any one quickly to determine the genera in his collection of U. S. Phasmidæ. Our species are few in number and all apterous. Only one of them, Diapheromera femorata (Say), extends into Canada.

A1 Tibiæ not furnished at apex beneath with a sunken areola to receive the base of the tarsi when bent upon them. (All of our genera of this division belong to the Bacunculidæ, in which the antennæ are much longer than the anterior femora and furnished with at least thirty joints, and the median segment is much shorter than the metanotum.)