Monographs of the Diptera of North America, Part 1v. 6No. 1-2Smithsonian Institutionxxiv–221
Loew, Friedrich Hermann and Osten-Sacken, Carl Robert. 1862. "Monographs of the Diptera of North America, Part 1." Smithsonian Miscellaneous Collections, 6, (1-2) xxiv–221.