New combinations and synonymies of leafcutter and mason bees of the Americas (Megachile, Hymenoptera, Megachilidae) Author Raw, Anthony text Zootaxa 2002 71 1 43 journal article 10.5281/zenodo.155887 29fc5ef3-a547-4eb8-9753-8085aa3f215e 1175­5326 155887 Subgenus Sayapis Titus Gnathocera Provancher 1882 : 232 . Type species: Gnathocera cephalica Provancher 1882 (= Megachile pugnata Say 1837 ). (Not Gnathocera Kirby 1825 [ Coleoptera ].) Ceratias Robertson 1903 : 172 . Type species: Megachile pugnata Say 1837 . (Not Ceratias Kroy 1845 [fish].) Sayapis Titus 1905 : 154. New name for Gnathocera and Ceratias . Megachile (Sayapis) Mitchell 1934 : 298 , 308. Michener et al 1994 : 149 , Michener 2000 : 565 . Eumegachile (Sayapis) Mitchell 1980 : 46 & 51. Durante & Diaz 1996 : 327 .