Before the new season starts, I'd like to make a last try with some unidentified photos from last year. The photos are not too good, but maybe at least the genus can be fixed. Otherwise I will delete them.
The first one should be Osmia (?), observed on Calendula officinalis, 21-06-2016, garden, north-eastern part of Lower Saxony, size about 7 mm (a little larger than O. caerulescens-male, as I remember it). The small beetle is probably Brassicogethes aeneus (about 2 mm).
best wishes, Jann