Genus Anterhynchium de Saussure, 1863

Anterhynchium de Saussure 1863: 205, name for division I of genus Rhynchium Spinola in de Saussure 1852: 103 .

Type species: Rygchium synagroides de Saussure, 1852, by subsequent designation of van der Vecht 1963: 73.

Differential diagnosis. Among the Afrotropical genera of Eumeninae with sessile metasoma and slit-like axillary fossa, the genus Anterhynchium appears superficially similar to Antodynerus de Saussure, Euodynerus Dalla Torre, Knemodynerus Blüthgen, Pseudagris de Saussure, Rhynchium Spinola, and Synagris Latreille. It can be easily distinguished by the following characters:

- clypeus not or shortly carinate (with long longitudinal carinae in Pseudagris);

- palpal formula 6-3 (5- 3 in Pseudagris, 3- 3 in Synagris);

- mesoscutum and scutellum entirely sculpted (largely impunctate in Rhynchium);

- tegula not equaling parategula (covering parategula in Knemodynerus, exceeding parategula in Antodynerus, equaling parategula in Euodynerus, Pseudagris, Rhynchium and Synagris);

- metanotum appearing subrectangular in dorsal view, evenly rounded or with a straight transverse carina (semicircular with a rounded carina in Antodynerus, with paired projections in Synagris);

- sides of propodeum crenulate or rounded (with a subtriangular depressed lobe in Synagris and some Antodynerus);

- posterior border of T1 similar to rest of surface (translucent in Antodynerus, Euodynerus and Knemodynerus).