A large and robust blue-green bee, and a first for me - on Cirsium discolor in a sandy field in CRP CP42, near the Erie Trail. Photos depict a single bee. Initially I ID it as O. chalybea, but O. Texana is similar and known from Indiana. [update] 'Linc Beestein' on FB referred me to Discoverlife traits for distinguishing O. chalabea and O. Texana, and I added two images that I think support his suggestion that it's more likely texana (smaller ocelli, denser punctations on central line of scutum, for starters). Still not sure though.