<ref name="Ashmead_1890">{{cite journal |first1=W. H. |last1=Ashmead |year=1890 |title=On the Hymenoptera of Colorado: descriptions of new species, notes and a list of the species found in the state |url=http://hymfiles.biosci.ohio-state.edu/pdfs-osuc/73/73.pdf |journal=Bulletin of the Colorado Biological Association |publisher= |volume=1 |issue= |pages=1–47 |doi= }}</ref>