Eoanthidium (Hemidiellum) riparium (Cockerell, 1929). Female holotype of Dianthidium riparium Cockerell, 1929 (syn.) from Thailand (A, B). Male from Thailand (BSRU-AB-4360) (C, D). Female from Laos (BMNH-ENT-2017-196 (ACQ)) (E), Female from Laos (BSRU-AA-1224) (F), male from Laos (BSRU-AA-1236) (G–K), and male from Thailand (BSRU-AB-4358) (L) H–J male genitalia in dorsal, ventral, and lateral view K male S8 L apical sterna of male in ventral view. Scale bars: 2 mm (D); 1 mm (A–C, E–G); 0.5 mm (H–L).