| Publication Type: | Journal Article |
| Year of Publication: | 1823 |
| Authors: | T. Say |
| Journal: | Journal of the Academy of Natural Sciences of Philadelphia |
| Volume: | 3 |
| Pagination: | 9–32, 33–64, 73–104 |
| Keywords: | Asilidae, Leptogaster, Leptogastrinae, Nearctic, Psilonyx, sp. nov. |
| URL: | http://www.biodiversitylibrary.org/pdf3/007372900079390.pdf |