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The Neotropical eumenine wasp Pachodynerus nasidens is recorded from Japan for the first time. Its recognition characteristics are noted. New records of this species from Micronesia and Polynesis are given and its distribution throughout the western Pacific is mapped and briefly discussed.

Six genera are recognized in the tribe Ammophilini: Ammophila, Podalonia, Eremnophila, Eremochares, Hoplammophila and Parapsammophila. A synonymical species checklist is given for the last three genera. A key to genera is provided which is based partially on characters heretofore unutilized.

A new subgenus is proposed for the following species of Ammophila: opulenta Guérin-Méneville, melanaria Dahlbom, binodis (Fabricius), aureonotata Cameron, catamarcensis Schrottky, willinki Menke, eximia Lepeletier, auromaculata Perez, and asperata Fox. A key to species is provided, with comparative and distributional notes. Ammophila willinki from Argentina and Brazil is described as new. Lectotypes are established for the following species: A. bimaculigera Strand, A. melanaria Dahlbom, A. miliaris Cameron, A. iridipennis Cameron, A. aureonotata Cameron, and A. asperata Fox. The following new synonymy is proposed: A. bimaculigera Strand (= opulenta Guérin-Méneville); A. lobicollis Cameron (= melanaria Dahlbom); Pelopoeus abbreviatus Fabricius, A. guiana Cameron, A. oxystoma Cameron (= binodis (Fabricius)); A. eugenia Smith, Sphex nigrocinctus Fernald, A. friedrichi Schrottky, A. trimaculigera Strand (= eximia Lepeletier); A. giacomellii Schrottky, (= auromaculata Perez); A. miliaris Cameron, A. iridipennis Cameron, A. velutina Schrottky (?= melanaria Dahlbom).