THE GENUS CENTRORHYNCHUS (ACANTHOCEPHALA) IN NORTH-AMERICA WITH DESCRIPTION OF CENTRORHYNCHUS-ROBUSTUS N-SP, REDESCRIPTION OF CENTRORHYNCHUS-CONSPECTUS, AND A KEY TO SPECIES

Reexamination of the type series of Centrorhynchus wardae Holloway, 19 58, and Centrorhynchus conspectus Van Cleave and Pratt, 1940, revealed no consistent difference between the 2 purported species; therefore, C. wardae is considered a junior synonym of C. conspectus. Specimens f rom additional collections are consistent with this view and provided adequate material for redescription of the species. Centrorhynchus rob ustus n. sp. resembles C. conspectus in the number of hooks per Salien t differences between the 2 species are size and body shape, with C. r obustus having a robust trunk with the widest diameter anteriad and C. conspectus being elongate with no region of the trunk consistently wi dest. Additionally, a conspicuous posteriad swelling exhibited by fema les of C. conspectus is lacking in C. robustus. Centrorhynchus kuntzi is reported for the first time from Montana and Nebraska, and C. consp ectus is reported for the first time from an eastern screech owl, Otus asio.