Halictus, Latreille, 1804

Murao, Ryuki & Gibbs, Jason, 2019, Halictus hedini hedini (Hymenoptera: Halictidae) newly recorded from Japan, revealed by DNA barcoding and morphology, Journal of Melittology 2019 (84), pp. 1-8 : 5

Key to Japanese Species of Halictus

1. Body entirely black in both sexes ............................................................................ 2

—. Body gold or green-metallic luster in both sexes ................................................... 3

2. Propodeum punctate on lateral and posterior surfaces in female; male genal area deeply concave; male second flagellomere approximately 2.4× first flagellomere ........................................ Halictus (Monilapis) tsingtouensis Strand

—. Propodeum wrinkled on lateral surface in female; male genal area nearly flat; male second flagellomere approximately 1.2× first flagellomere ......................... .......................................................... Halictus (Protohalictus) hedini hedini Blüthgen

3. Distance between lateral ocellus and vertex marginally long, approximately over 3× diameter of ocelli in female; both sexes with pronotum with transverse ridges in both sexes; male six metasomal sternum flat ............................................. ............................................................................... Halictus (Seladonia) aerarius Smith

—. Distance between lateral ocellus and vertex marginally short, approximately 1.6–2.4× diameter of ocelli in female; both sexes pronotum nearly smooth in both sexes; male six metasomal sternum deeply concave ....................................... .............................................. Halictus (Seladonia) tumulorum ferripennis (Cockerell)