Family Megachilidae - Leafcutter, Mason, and Resin Bees, and allies

(Taken from the website and pasted below...)
"Intention of the website
The “Palaearctic Osmiine Bees” website intends to give a concentrated but concise overview on taxonomy, distribution, nesting biology and flower preferences of all osmiine bee species known to occur in the Palaearctic region. Scientific basis for the data on taxonomy and distribution is the recently published “Taxonomic catalogue of the Palaearctic bees of the tribe Osmiini” (Ungricht et al., 2008). The biological data are based on an extensive literature study on osmiine nesting biology (A. Müller, C. Praz, J. Neff, G. Le Goff and C. Sedivy, unpublished), on a compilation of flower records from the literature (A. Müller, unpublished) as well as on results of ongoing pollen-analytical studies at the Entomological Collection of the ETH Zürich. The information for each species will be updated and corrected in regular intervals. Important new findings or major corrections will be communicated and justified in the “Updates and Corrections” part of the website. Here, all interested readers are invited to scientifically comment on new entries by using the blog facility of the website.

[cite:1627566

In September, 2018, photographers Paula Sharp and Ross Eatman commenced a new project, documenting the extraordinary diversity of wild bee species at the National Butterfly Center in Mission, Texas. This website chronicles the ongoing NBC project.

Introduction

About the Photographers

modest page with links to many helpful resources
[cite:1023098]

A good resource for people interested in the pollination services provided by native bees, as well as some other insects.