Notes on North American Diptera with Descriptions of New Species in the Collection of the Illinois State Laboratory of Natural History

In the course of my work of identifying and arranging the Diptera in the collection of the State Laboratory of Natural History I have found several which belong to apparently undescribed species. I have in many cases given to these forms manuscript names, and as certain of the species may figure in the publications of the Laboratory, or in those of the State Entomologist, it is deemed advisable to publish descriptions of these species so as to validate the names under which they stand in the collection.published or submitted for publicationis peer reviewe