Krombeinella Pate, 1947 (as subgenus of Myrmosa Latreille, 1796). Canad. Ent. 78(11): 197. Male, female.

Gender. Feminine.

Type species. Hylaeus thoracicus Fabricius, 1793 (male), by original designation.

Taxonomic history. Raised to generic status by Lelej, 1985b: 57. Valid generic name.

Sex association. The female of the type species was associated and identified (as Myrmosa dubia Costa, 1858: 7) by André, 1900: 110.

Distribution. Palaearctic.