Abstract
The early appearance in geological time of terrestrial Arthropods _L has always been to me a subject of deep interest, and I have been fortunate in noticing several of these in the pages of this Magazine and elsewhere. The oldest insect at present recorded is the impression of an Orthopterous wing referred to the family Blattidæ:, obtained from the Silurian sandstone of Jurques, Calvados, France, about the horizon of the May Hill Sandstone (Middle Silurian). M. Charles Brongniart, its discoverer, observes that what is especially remarkable about this fossil, and which distinguishes it from all other Cockroach-wings, living or fossil, is the length of the anal vein, and the narrowness of the axillary area.
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