Here's a picture of the development of a leaf-cutter bee species we collected in our bamboo nests. After eating all of the provisioned pollen within its cell, the last instar larva (left) molts into a new pupa (2nd from left). The older pupa (2nd from right) looks much like an adult bee (right) but is still developing it's wings and other internal anatomy.
For those of you interested in native bees, there's a new collaborative citizen science project to document occurrences of those big and charismatic buzzers, the bumble bees. At Bumble Bee Watch you can upload photos of bumble bees, learn ID, and check out recorded sightings in your area! I'm sure I'll be adding some photos to their database soon!
Also, another citizen science project occurring locally is The Bees' Needs. Through it you can help participate in a study documenting wood nesting bee species all along the Front Range. Details on both studies can be found on their websites.
I am a researcher at CU-Boulder leading a USDA funded project looking at native bee diversity in agricultural landscapes of eastern Colorado. Please enjoy your visit and contact me if you have any questions.