The systematic collections of the Yale Peabody Museum’s Division of Entomology comprise over 1,000,000 curated specimens. Division holdings include important collections of Lepidoptera, arachnids, Orthoptera, Coleoptera, water beetles and midges, and specialty collections on evolutionary themes. Recent acquisitions also include historically important collections from other institutions. The Division also maintains a general entomological library of periodicals, books and reprints that includes coverage of arachnology donated from the Alexander Petrunkevitch Library.