What is it?

I found this near the patio doors this lunchtime. It seemed 98% dead, barely moving, so after I took it's picture I pot it outside on a dandelion flower. It wasn't there later so either it had recovered and flown off or had been blown off by the wind.

It looks like a bee but the legs were more thin and elongated, like a mosquito. At the front there seemed to be either a very stiff tongue or a stinger of some sort. It's wings had either gained or lost pigmentation, and the fur down it's back was patchy - bee coloured round the sides but bare black down the middle.

Any ideas?