Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Revision of the nearctic species of Helophilus and allied genera
By C. H. Curran and C. L. Fluke
Transactions of the Wisconsin Academy of Sciences, Arts and Letters, 1926
Cite: 514662 with citation markup [cite:514662]
Volume 2 of Manual of Nearctic Diptera cites this reference as the latest for a few genera of Eristalini.

Online at http://digicoll-dev.library.wisc.edu/cgi-bin/WI/WI-idx?type=article&did=WI.WT1926.CHCurran&id=WI.WT1926&isize=M