Abstract
AbstractThe Nearctic fauna of the subgenusCerodontha(Cerodontha) Rondani is revised and contains 10 species:C.aduncasp.nov. (Mexico),C.dorsalis(Loew) (widespread Nearctic, eastern Palaearctic, Neotropical),C.gracilisSpencer (western Nearctic),C.inflatasp.nov. (Mexico),C.occidentalisSehgal (northwestern Nearctic),C.occidoparvasp.nov. (western Nearctic),C.tolucasp.nov. (Mexico),C.trispinataSpencer (Mexico),C.trispinellaSpencer (Mexico), andC.trispinosaSpencer (Mexico). All Nearctic species are described and illustrated and a key to species is provided. There are two colour forms of the widespread Nearctic speciesC.dorsalis: a pale eastern form and a dark western form, although there is overlap in the geographic distribution of the two forms and intermediates exist. The six Mexican species are known from a total of only nine specimens, suggesting that the diversity of this subgenus in Mexico and Central America may be higher than currently known.
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