Nomenclatural Changes and New Geographic Distribution Records for New World Species of Dacnusni (Hymenoptera: Braconidae)

Nomenclatural changes are provided for species of Dacnusini that occur in the New World. Chorebus aquaticus Muesebeck, 1950 is a new junior synonym of Chorebus astigmus (Ashmead, 1901). The status of specimens in the type series for Rhizarcha astigma Ashmead (treated herein as C. astigmus) is clarified. Dacnusa alaskensis (Ashmead, 1902) is returned from Chorebus Haliday. Chorebus posticus (Haliday, 1839) is reported from the Nearctic Region for the first time from the U.S. (Kansas, New Mexico, North Carolina); it is also reported within the Palearctic Region from Denmark for the first time. Chorebus astigmus is reported from the Palearctic Region for the first time (Czech Republic, England, Germany); it is also reported within the Nearctic Region from Mexico and Utah for the first time. The new distribution records for those two species represent their first documentation as having a Holarctic distribution. Additional new country, state, and provincial distribution records are reported for Chorebus crassitelus (Provancher, 1886) (Manitoba, North Carolina), Chorebus harringtoni (Ashmead, 1902) (Canada), Chorebus laeviceps (Cresson, 1872) (Kansas, Ohio), and Coelinius hopkinsii Ashmead, 1893 (Missouri).