female; lateral view
male; lateral view

Scientific Name: Anthidiellum robertsoni (Cockerell, 1904)

Common Name: Anthidiellum robertsoni


Dianthidium robertsoni Cockerell, 1904: 4 [♀,♂‚]

Syntypes ♀,♂‚. USA, California, Los Angeles and Rock Creek, by Dr. Davidson []

Anthidiellum robertsoni race citrinellum Cockerell, 1925: 362 [♂‚]

Holotype ♂‚. USA, California, Fresno Co., Huntington Lake at 7000 ft, 17 July 1919, by E.P. Van Duzee [CAS no. 1744]


Species Notes

Based on distinct differences in the cytochrome c oxidase I (COI) gene that resulted in two distinct Barcode Index Numbers (BINs) (see Sheffield et al. 2017), Sheffield and Heron (2018) agreed with Urban (2001) and considered A. robertsoni a separate species from the eastern A. notatum (Latreille).

The DNA Barcode Index Number (BIN) for this species is BOLD:AAE5295.



The nesting biology of A. robertsoni was reported from British Columbia by Leech (1947). The nest was a single cell constructed on the flat underside of a piece of wood (Douglas fir), and was 13 mm long with an apical spike, appeared somewhat warty, and was greenish black with a vitreous surface.

Sociality: Solitary
Nesting: Mason
Pollen Specialization: Polylectic
Wintering Stage: Mature Larva

Crop Preference: Not Available
Non Crop Preference: Not Available

Distribution: British Columbia
Ecozone: Western Interior Basin

Distribution Map