Annual report of the Board of Regents of the Smithsonian Institution . B Figure l. -Carboniferous roaches. A, Asemoblatta mazona (from Handlirsch afterScudder); B, Fhytloblatta carbonarit (from Handlirsch* mologists find many characters that separate the Paleodictyopteraand their associates from their modern relatives, but the distinctivefeatures have to do mostly with details of the wing venation. All the

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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840