Appearance
The banksia bee has a metallic blue abdomen and yellow face markings. The sexual dimorphism of this species is notable amongst bees — the males of the species are significantly larger than the females; in most other types of bee, females are larger than males. Males of different sizes have been shown to display different feeding behaviour. Large males perch and defend "Banksia" inflorescences that are in high positions on the shrub where they feed; small males feed closer to the ground and patrol circuits including several inflorescences. Displacement of large males from the perches is almost always by an even larger male.
Naming
The banksia bee was originally described by German entomologist Wilhelm Ferdinand Erichson in 1842; its specific epithet is derived from the Ancient Greek "halcyon" "kingfisher" relating to its kingfisher blue colour.Behavior
Western Australian banksias which the bee has been recorded visiting include "Banksia ashbyi", "B. coccinea", "B. hookeriana", "B. ilicifolia", "B. menziesii", "B. prionotes", "B. sessilis", and "B. speciosa". Other species include "Allocasuarina campestris", "Grevillea cagiana", "G. eriostachya", "Isopogon dubius", and Xanthorrhoea" species.The Banksia bee faces competition from the introduced European honey bee. In sites where the species coexist, the Banksia bee has significantly fewer nests that it has on sites where there is no competition. A banksia bee nest consists of several cavities or cells within hollowed pieces of wood. A parent bee places provisions of pollen and nectar in each cell, along with a single egg.
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