Revision of the Mexicana-group of the cycloteline genus Ozodiceromyia Bigot (Diptera: Therevidae)

The mexicana-group of the cycloteline genus Ozodiceromyia Bigot (Diptera: Therevidae) is treated. The two previously described species of the group, Ozodiceromyia mexicana Bigot (the type species) and Ozodiceromyia argentifera (Krober), are redescribed, and two new species, Ozodiceromyia livdahli and Ozodiceromyia parargentifera, are described. In addition, a neotype is designated for Phycus argentifer Krober, and a lectotype is designated for Euphycus setosus Krober, a junior subjective synonym of Ozodiceromyia mexicana. A phylogenetic hypothesis is discussed for the relationships among these taxa, characters and their evolution are discussed, a key to species is provided, and each species is diagnosed.