I took this photo while I was teaching on a field course in Spain earlier this month (harder work than it sounds).  It was a nice opportunity to try out my camera (which I have been trying and failing to do on this blog) as spring is in full swing over there.  I was amazed by the diversity of animals that I only found on flowers (although part of that might have been that the flower-dwellers were more noticeable…), but I was surprised to see what look like two different life history stages of potentially the same species on a single flower.  Does anybody know what this beetle is…?

UPDATE 21/7/13: My friend Patrick suggests that it could be Cryptocephalus rugicollis.  Looks like a good call to me!