Pennsylvania entomologist, conchologist and philologist; corresponding member of the Academy and the first correspondent of the Entomological Society of Philadelphia. The group of entomologists thought so highly of Haldeman that his name was used in the decorative scroll of the membership certificate of the Society, along with Cuvier and other famous naturalists. The collection consists of 704 letters addressed to Haldeman, Rafinesque and Say, with a letterbook of 22 letters written by Haldeman. In subject, the letters refere to paleontology, conchology, entomology, ichthyology, to Indian relics and to spelling reform. A letter from Leidy is illustrated and several of those written by Haldeman bear pencil sketches. In his letterbook is information about a proposed U. S. Naval Expedition to South America with I. G. Strain, and queries about J. C. Reinhardt as a member of the personnel. The authors number 151.