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This genus is related to Damalis Fabricius. It is distinguished by having the dorsum of thorax clothed with very dense yellow pile (as in Bombomina); this pile is mostly erect and so dense that the ground color is almost concealed. The species of Damalis are more sparsely haired, with the pile mostly recumbent and not at all concealing the ground color.

The species discussed below have been received from the United States National Museum, the American Museum of Natural History, Cambridge Museum of Comparative Zoology, Cornell University, Michigan State College, British Museum of Natural History, and Deutsches Entomologisches Institute, or are in the Snow Entomological Collection at the University of Kansas. The writer is very grateful to these institutions for the privilege of studying this material. These species will be keyed and figured in a forthcoming revision of the New World Plecia.

The material here described represents three new species and one new variety. These were received by the writer from J. K. Jacob of the University of British Columbia and from D. Denning of the University of Minnesota.