In 1927 T. H. Frison published a list of all the insect types in the collections of the Illinois Natural History Survey and the University of Illinois and the Bolter collection. This list contained 1,067 primary types. Type-specimens in the University of Illinois have subsequently been transferred to the collection of the Illinois Natural History Survey. In the past 50 years 2,113 primary types have been added to the Survey's collection, primarily through the systematic research of T. H. Frison in Plecoptera and Hymenoptera; H. H. Ross in Trichoptera, Plecoptera, Homoptera, and Hymenoptera; H. B. Mills in Collembola; and L. J. Stannard, Jr., in Thysanoptera. The acquisitions of the personal collections of J. W. Folsom in Collembola and C. A. Robertson in Hymenoptera added numerous primary types to the Survey's collections. In addition, several active workers have periodically, or occasionally, deposited their types in the Survey's permanent collection upon completion of specific revisionary studies. Recently, Gerdes (1977) and Mari Mutt (1978) have published lists of all of the types of Thysanoptera and Collembola, respectively, in the Natural History Survey collection.
In this list only primary types currently located in or on loan from the Illinois Natural History Survey collection are listed along with the original citation for each species. The literature citation for the designation of ach neotype and lectotype is also cited. To clarify the type designation within the bees of the Robertson collection, lectotype specimens have been designated by W. E. LaBerge for those species not previously designated in the literature. The genera under which the species are listed are those under which they were originally described. Where possible the sex of each type is given. The term syntype is used in the sense of Article 73c of the International Code of Zoological Nomenclature (1964) and replaces the term cotype used by Frison (1927).
For simplicity, the within each order alphabetically, the genera are arranged alphabetically within each family, and the species are arranged alphabetically within each genus.
Descriptions of Nearctic Caddis Flies (Trichoptera)
