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Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associa...
By Victor H. Gonzalez , Terry L. Griswold
Zoological Journal of the Linnean Society, Vol. 168(2), pp. 221–425, 2013
Cite: 1402221 with citation markup [cite:1402221]
This is an outstanding reference covering New World members of the genus Anthidium.

The full title is:

"Wool carder bees of the genus Anthidium in the Western Hemisphere (Hymenoptera: Megachilidae): diversity, host plant associations, phylogeny, and biogeography"
The 200+ page revision can be:

1) Freely viewed online at the URL:   https://academic.oup.com/zoolinnean/article/168/2/221/2433440/Wool-carder-bees-of-the-genus-Anthidium-in-the  
    An advantage of this HTML version is the availablity of useful hyperlinks to figures and sections throughout the work, which help navigate through the document while reading.

2) Freely downloaded as a PDF at the URL:   http://digitalcommons.unl.edu/usdaarsfacpub/1251/  
This revision contains much useful general information about the genus Anthidium, as well as detailed: keys, descriptions, range info & maps, host plant associations, and photos & line drawings of principal characters...for every currently recognized species in the western hemisphere. It circumscribes 92 species in the region, 21 of which are newly described...and it clarifies many additional technical taxonomic issues.

A large & detailed suite of characters and an associated matrix indicating their presence among all New World species are provided. Various hypotheses regarding phylogeny and biogeography are also presented.

Overall, this is the most comprehensive treatment available for Anthidium of the Western Hemisphere...an excellent reference work!