Philadelphia orthopterist, field worker and collector, Hebard spent his active life in close association with the Dept. of Insects of the Academy. Here he was a devoted curator and benefactor, leaving his extensive collection to the department. His collecting, often with J. A. G. Rehn covered a great deal of the New World and Europe, while his exchanges and purchases throughout the world increased the numbers of the Orthoptera collection tremendously. His financial backing resulted in increased equipment and housing for specimens to say nothing of the publication costs met by him.

The correspondence is chiefly related to his Orthoptera, but some curatorial business for the Academy is included. No list of authors has been prepared.