Key to Subgenera of Dietta of Latin America (modified from Peck & Cook, 2003)

1a Clypeus lightly sclerotized, pale; procoxal cavities externally widely open; widely distributed in South America.................................................................................................. subgenus Dietta

1b Clypeus heavily sclerotized, dark; procoxal cavities externally narrowly closed; distributed from Mexico to Panama and adja- cent northwestern South America to western Ecuador ......................................... subgenus Mesodietta