Revision of nearctic species of Cerodontha (Cerodontha) (Diptera: Agromyzidae)

The Nearctic fauna of the subgenus Cerodontha (Cerodontha) Rondani is revised and contains 10 species: C. adunca sp.nov. (Mexico), C. dorsalis (Loew) (widespread Nearctic, eastern Palaearctic, Neotropical), C. gracilis Spencer (western Nearctic), C. inflata sp.nov. (Mexico), C. occidentalis Sehgal (northwestern Nearctic), C. occidoparva sp.nov. (western Nearctic), C. toluca sp.nov. (Mexico), C. trispinata Spencer (Mexico), C. trispinella Spencer (Mexico), and C trispinosa Spencer (Mexico). All Nearctic species are described and illustrated and a key to species is provided. There are two colour forms of the widespread Nearctic species C. 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.