We redescribe and present new diagnoses of the Hylaeus gibbus group in Europe. Species
of this group were often confused with each other. Our method of distinguishing between the
species is based on dividing three commonly recognised species into four. We present
diagnoses and list the characteristics of Hylaeus confusus Nylander, 1852; Hylaeus gibbus
Saunders, 1850; and Hylaeus pictus (Smith, 1853). For the newly characterised form, one of
Förster's available names has been resurrected—Hylaeus incongruus Förster, 1871 …

Contribution to the taxonomy of the Hylaeus gibbus species group in Europe (Hymenoptera,
Apoidea and Colletidae) … Contribution to the taxonomy of the Hylaeus gibbus species group
in Europe (Hymenoptera, Apoidea and Colletidae) … Plazi.org taxonomic treatments database …