|3.Petiole in profile a simple, transversely flattened strip (Fig. 23).
(one species, T. sessile, collected in all Midwestern states, additionally an introduced tropical species, T. melanocephalum collected in greenhouses or heated buildings in Iowa and Minnesota)
|   Petiole in profile with a small, but distinct erect scale (Fig. 24).
(collected in Iowa, Illinois, Indiana, Minnesota, North Dakota, and Wisconsin)
| Please send any questions or comments regarding these pages to Tim Linksvayer (Tim.Linksvayer@alumni.carleton.edu)